The botched Renewable Heat Incentive (RHI) scheme was set up to encourage uptake of eco-friendly heat systems over the use of fossil fuels.

But its overgenerous offer of fuel subsidies meant it could cost taxpayers an extra £490m.
The fall out has now caused the collapse of the power-sharing Northern Ireland Executive.
BBC News NI looks at those who have found themselves in the spotlight over the scandal.
Northern Ireland's former first minister, Arlene Foster, headed up the Department of Enterprise, Trade and Investment (Deti) when the RHI scheme was designed.
Crucial controls to limit the scheme's cost were not introduced, something she has since said is her "deepest political regret".
But the Democratic Unionist Party (DUP) leader fiercely contested claims by Jonathan Bell - her party colleague and successor as enterprise minister - that she ordered him to keep the scheme open.
In the wake of his allegations, Mrs Foster faced calls to step aside to allow a judge-led public inquiry into the scheme.
Mrs Foster re-stated in January that she would not be standing down over the issue, adding that some calls for her to do so were "misogynistic".
In the end, her time as first minister was brought to an abrupt end when the Deputy First Minister, Martin McGuinness, resigned, forcing an election.
Jonathan Bell was the minister at Deti during the period that the RHI scheme did the most damage to the public purse.
A total of £485m was committed when applications suddenly flooded the department in October and November 2015.
But in an explosive interview with the BBC's Stephen Nolan earlier this month, Mr Bell said he tried to close it down before that point, only to be thwarted by DUP advisers.
He also accused the advisers of trying to alter documents "without my knowledge, without my consent".
The DUP MLA has called for a public inquiry into the scandal, and has since been suspended by his party.
Although he shies away from the public eye, Timothy Johnston (above left, with former DUP leader Peter Robinson) has long been regarded as perhaps the most powerful official behind the scenes at the DUP.
In the days when the party opposed David Trimble's Ulster Unionists, Mr Johnston was its communications director, working particularly closely with Peter Robinson.
He was involved in the negotiations around the St Andrews Agreement that led to the restoration of devolution in 2007, and has been an adviser at Stormont Castle for Ian Paisley, Peter Robinson and now Arlene Foster.
The Paisley family publicly blamed Mr Johnston for compiling a critical survey about Dr Paisley's leadership before the party founder resigned, a claim he said was regrettable and inaccurate.
He is one of two DUP advisers that Jonathan Bell has claimed would not allow the RHI scheme to close in early-autumn 2015, but he has rejected that allegation.
As an adviser to Arlene Foster, he is paid the maximum salary allowed for a special adviser - £91,809
A son of a farmer from Beragh in County Tyrone, Dr Andrew Crawford is a former employee of the Ulster Farmers' Union.
He was an assistant to the former DUP MEP Jim Allister before the North Antrim politician quit to form the Traditional Unionist Voice (TUV).
Dr Crawford was an adviser to Arlene Foster when she was enterprise minister during the time the RHI scheme was created, and followed her to the Department of Finance and Personnel last year.
Jonathan Bell accused him of preventing the closure of the scheme, but Dr Crawford has denied that claim.
He was also named by senior civil servant Andrew McCormick, in a PAC hearing, as the adviser who exerted influence to keep the scheme open - although Dr McCormick said he had no evidence for his claim.
These days, he advises another DUP minister, Michelle McIlveen in the Department of Agriculture, Environment and Rural Affairs.
Dr Crawford's poultry-farmer brother is a claimant of the RHI scheme.
A qualified barrister, Richard Bullick is one of the DUP's most important policy advisers and has been deeply involved in various political negotiations down through the years.
Last year, he gave evidence to a Stormont committee about contacts between ministers and bidders involved in the controversial Nama property deal.
In the more distant past, he was a junior barrister to Jim Allister and was involved in the DUP's decision to lure Mr Allister back from the legal world to replace Ian Paisley as an MEP.
But the DUP's leadership came to regret that move later, when Mr Allister rejected its deal with Sinn Féin and set up his own party, the TUV.
Mr Bullick now works as an adviser to Arlene Foster in the Executive Office, and is paid the maximum allowed for a special adviser - £91,809
Jonathan Bell said Mr Bullick was present for his "hostile" meeting with the first minister, but the adviser has said he was not there.
One of the more recognisable of the DUP's advisers over the years, Stephen Brimstone is no stranger to controversy.
He was an aide to the former social development minister Nelson McCausland, during which time he became entangled in the Red Sky housing maintenance scandal, and his treatment of then DUP councillor Jenny Palmer over that affair led to her whistleblowing on a BBC Spotlight programme.
Mr Brimstone was later promoted to advise the first minister but resigned from his role in November.
According to Jonathan Bell, Mr Brimstone was one of three advisers who witnessed a tense and angry exchange between him and Arlene Foster over the proposed closure of the scheme in early 2016, but he, like Mr Bullick, said that was not the case.
He has confirmed that he is a claimant on the RHI scheme, but Arlene Foster has said his link to it was not a factor in his decision to quit his £91,809-a-year job.
His brother, Aaron, is also a beneficiary of the green energy initiative, the Irish News reported in December.
Timothy Cairns was Jonathan Bell's adviser at Deti, and offered advice to the minister about the controversial RHI scheme.
But he has said that the ultimate decisions about it were for the minister to make.
Mr Bell said his adviser told him that other DUP advisers were preventing the closure of the scheme.
Timothy Cairns previously worked as an aide to Peter Robinson when he was first minister, but is no longer employed as a DUP adviser.
As the permanent secretary at the Department for the Economy, formerly Deti, Dr Andrew McCormick is the man who has to clear up much of the mess of the RHI scheme.
He arrived at the department in 2014, long after the scheme was conceived, and drew Jonathan Bell's attention to major concerns over its operation in the summer of 2015.
In an email in January 2016, Dr McCormick said there was "some initial reluctance" to limit the generous tariff offered by the scheme shortly before a crucial spike in applications that led to a spending commitment of almost half-a-billion pounds.
And appearing before Stormont's Public Accounts Committee in November, he said a whistleblower flagged concerns with the scheme two years before its closure, but she was not believed by officials.
A former permanent secretary at Deti, David Sterling has denied trying to "duck responsibility" for his role in the RHI scheme's set-up.
"I'm not seeking to pass the buck," he told Stormont's Public Accounts Committee. "I accept responsibility for failures which occurred during my time."
But he told the committee's inquiry on the RHI fiasco that he had "no satisfactory answer" for why a planned review of the initiative in January 2014 did not happen.
Mr Sterling moved to the top civil service post in the Department of Finance and Personnel in July 2014.
Jonathan Bell claimed that Chris Stewart, his deputy permanent secretary at Deti, sought a one-to-one meeting to blow the whistle on an attempt by DUP advisers to remove references to Arlene Foster from official documents about the RHI scheme.
The former minister said Mr Stewart was willing to back his claims in a public inquiry, but three days later the civil servant disputed Mr Bell's version of events.
He said he "did not seek a meeting as a whistleblower".
He did acknowledge that a DUP adviser changed wording of a Deti document, but added that Mr Bell later "advised that he had dealt with the matter to his satisfaction".
Up until June 2016, John Robinson was the DUP's director of communications, a role he relinquished when he was appointed as a special adviser to the Department for the Economy.
Jonathan Bell named Mr Robinson on the Assembly floor as one of two DUP advisers - the other was Timothy Johnston - with "extensive interests in the poultry industry".
At the time, Mr Robinson said his family farm has chicken houses which are not part of the RHI scheme but did not mention his in-laws had benefitted from the green energy subsidy.
The party described Mr Bell's comments as "nothing short of mud-slinging".
When the Press Association revealed his father-in-law's involvement in the scheme, Mr Robinson issued a statement explaining that, before he got married, his father-in-law purchased two 36kw boilers for his poultry business in May 2015 and applied to the scheme on 3rd August 2015.
He said he did not discuss RHI with his father-in-law and that neither he, nor his wife, had any role or benefit in his in-laws' farming business.


Saracens have completed the signing of Northampton and England wing Chris Ashton on a "long-term" contract.

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The 24-year-old, whose Saints deal expires in the summer, will join Sarries for the 2012-13 campaign.
The length of Ashton's deal has not been disclosed by the reigning Premiership champions.
"I've decided to join Saracens from next season... until then it's all about Saints," he said on social networking site Twitter.
A spokesman for Saracens added: "We are obviously especially delighted but, for now, Chris remains a Northampton player.
"Out of respect for Saints, Saracens will not make any further comment on the matter."
BBC Look East understands that Saints director of rugby Jim Mallinder will not include Ashton in his starting line-up for Saturday's Heineken Cup Pool One visit of Munster.
The move brings to an end months of speculation over the future of Ashton, who has been allowed to speak to other clubs since New Year's Day.
Saints had said they would not break the bank to keep him at the club, but it is understood that the player's eagerness to leave was motivated more by a desire for a change of scenery after four years at Franklin's Gardens.
Reacting to Ashton's departure, Mallinder said: "We're obviously disappointed that Chris has decided he wants to play his rugby elsewhere.
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"That said, we have known for some time that Chris was looking elsewhere and had been planning to use that part of the salary cap by strengthening our squad in a number of positions.
"We've also got several good wingers at the club who have all been pushing for a first team spot this season, the likes of Jamie Elliott, Vasily Artemyev, Scott Armstrong, Paul Diggin and Noah Cato, plus Anders Mogensen in the academy who has been playing well on loan for Cambridge."
Ashton has made 105 appearances for Northampton, scoring 95 tries, since his cross-code switch from Wigan in 2007.
He will now join up with his friend Joel Tomkins, the former Wigan and Great Britain rugby league player.
But he will leave Northampton with a big gap to fill having proved he is a devastating finisher.
Although he has drawn negative publicity recently, having been banned for four weeks for pulling the hair of Leicester's Alesana Tuilagi and being reprimanded while at the Rugby World Cup, he was also the tournament's joint-top try scorer and has totalled 15 tries in 18 Tests for England.


World boxing champion Kell Brook is in hospital in Tenerife after being stabbed in the leg while on holiday.

The boxer from Sheffield is in a stable condition according to his promoters Matchroom. No arrests have been made.
A spokeswoman for Spain's Guardia Civil said the 28-year-old was stabbed in the left leg at Golf del Sur in San Miguel de Abona and "lost a lot of blood".
Brook won the IBF welterweight title when he beat American Shawn Porter in California last month.
It is the second time Brook has been stabbed, after an incident in Sheffield in 2007.
Brook's win over Porter stretched his unbeaten professional record to 33 fights and he is being lined up for a fight against Amir Khan next - expected to take place on 6 December.
His trainer Dominic Ingle told BBC Look North: "We've been through a lot together, me and Kell, and receiving the news this morning hit me in the pit of my stomach. It's a sickening feeling.
"I think he's stable, his mum and dad's gone out today to see him in hospital.
"He's a fighter Kell, we don't know the extent of his injuries but whichever way, knowing Kell, he'll try and make that date [in December] if he can."


Having already completed the loan signing of, ahem, the 'English Messi' - the 19-year-old Patrick Roberts  - Celtic have now, it seems, plunged for a 'Norwegian wonderkid' in Kristoffer Ajer, the 17-year-old just brought in from IK Start on a four-year deal.

Ajer, a project player for now, brings the number of midfielders at Celtic Park to 17 with another five currently on loan at lower-league clubs. On the face of it, 17 - or 22 depending on how you look at it - is an eye-watering number, but, of course, the overall figure is a bit misleading.
Among that cavalry are young players on loan and who may never get a look-in, plus the deadwood that is Derk Boerrigter, a passenger who has cost Celtic, between transfer fee and wages, somewhere north of £4.5m since his arrival from Ajax in 2013.
Strip out those who haven't got any kind of realistic shot at the first team next season and you are still left with more than a dozen and possibly as many 14 or 15 midfield players at Celtic Park.
The club is on a hoarding mission. In one area of the pitch they're bursting at the seams. In another area - up front - they are almost threadbare.
Consider opening day next season and the possible Celtic line-up from their usual two holding players to the three ahead of them and then Leigh Griffiths up top. Scott Brown and Nir Bitton would probably be the two buffers. Stuart Armstrong, Stefan Johansen and Gary Mackay-Steven could be the three.
Or maybe Charlie Mulgrew and Ajer - if he develops quickly - could be the holding players with James Forrest, Kris Commons and Roberts ahead of them. Then again, Callum McGregor and Liam Henderson - presuming he returns from Hibs - could hold the fort in the defensive midfield roles with Tom Rogic, Scott Allan and Ryan Christie playing in the advanced positions.
Choices, choices. Too many. There isn't a chance in hell that manager Ronny Deila can keep everybody, never mind keep everybody sweet.
Ajer is a development player so he can't be expecting much game-time - he might end up as a centre-half in any event - but most of the rest of them will be looking for plenty of action and most of them are going to be disappointed.
Roberts is an interesting customer. Clearly he's an extremely talented kid and, after Manchester City paid £12m for him, his reputation is skyscraper-high. He's not Celtic's player, but the next 18 months could see him thrill fans and make them suspend reality and pretend that he's one of their own.
If you can forget for a moment that he's only there on loan, Roberts' signing could be something special.
Manchester City would not have given him to Celtic for that length of time if the deal didn't come with a commitment to play him regularly. That was Celtic's bargaining chip - first-team football.
Who would you have alongside him? Commons, Johansen, Rogic, McGregor, Allan? And who would play outside him? Armstrong, Mackay-Steven, Forrest, Christie, Henderson?
Celtic have more midfielders in their squad than Imelda Marcos had shoes in her wardrobe.
Some will be bit-part players, some will have no part to play at all and will be quietly moved on.
There needs to be a cull. Deila has arrived at a bizarre situation where he has way too many midfielders - and too many similar-type midfielders - and not nearly enough strikers - and only one effective striker.
The imbalance is the thing. In defence, Celtic are attempting to make things right. They have a first-choice of Mikael Lustig, Jozo Simunovic, Erik Sviatchenko and Kieran Tierney. Lustig is the only one of that lot who's over 24. That's a promising combination once it has a chance to bed-in.
The back-up doesn't inspire confidence, but at least it exists in bits and pieces. Up front, Griffiths is not just The Man, he's pretty much The Only Man.
You'd call Colin Kazim-Richards a deeply odd acquisition but then what level of puzzlement would you reserve for Carlton Cole? These two have a combined age of 61, zero sell-on value and a questionable - at best - goal threat.
Celtic's most expensive strikers are on loan. Nadir Ciftci is in Turkey, Stefan Scepovic is in Spain and Anthony Stokes is in Edinburgh but may as well be in Timbuktu as far as Deila is concerned.
Deila is packing his squad with midfielders and giving himself a world of choice, but in the business of strikers Celtic continue to leave themselves curiously short.
At some point in the summer they'll need to think about the doomsday question and come up with a compelling answer: What happens if Griffiths gets injured or loses form? How do you like the sound of 4-6-0?


Pay packages for three directors at a television company that received a £4m Welsh Government loan have been criticised by the Welsh Conservatives.

Accounts for Bad Wolf revealed large remuneration packages worth a total of £1.8m over 18-months.
Tory AM Suzy Davies said the payments were a "cause for concern".
But the firm said the company has brought in millions more in investment to Wales, and says it has just struck deals with HBO and Sky.
The two firms have taken a minority stake in the company. Bad Wolf said it would be paying back the loan with interest.
The company, which was set up in 2015 by former BBC executives Julie Gardner and Jane Tranter and is based in south Wales and Los Angeles, is currently working on two series, A Discovery Of Witches and His Dark Materials.
Accounts for July 2015 to December 2016 show the Welsh Government gave the firm a loan worth just under £4m.
The documents says that Ms Tranter received £855,417 while Ms Gardner was given £519,301. A third director, Miles Ketley, received £441,539.  He resigned from the company in March 2017.
Part of Ms Tranter's pay - £300,000 - was earmarked for relocation expenses. She was also given a loan of £270,645.  At the end of 2016 £186,861 of the loan was still owing.
The accounts state that the firm achieved a turnover of £1.8m and a gross profit of £519,941, but after administrative expenses of £3.7m it made a loss of £3.1m.
Ms Davies, the Welsh Conservative's culture spokeswoman, said while the party hopes that Bad Wolf and its pipeline projects will achieve great success, "there are aspects of its finances which are concerning".
She said it was "curious" why the Welsh Government loan was guaranteed against the value of the company's assets, which she said the report showed "are worth a mere fraction relative to the loan's value".
"That the three directors are collectively paying themselves an annual income equivalent to nearly half of loan's value is also a cause for concern - especially given that their projects are still in the inchoate stages and are yet to make a return," she said.
"The Welsh Government's less-than-stellar record on investment decisions has been well-publicised, and taxpayers will rightly be questioning how ministers have found themselves in this position yet again - especially in a sector where Wales is working hard to promote a strong international offer."
A spokesman for Bad Wolf said: "Welsh Government loaned £4 million to Bad Wolf to launch a business that would develop international TV production in Wales - to be repaid with interest.
"Since then Bad Wolf has brought in over double that amount in investment from outside companies with further investment from HBO and Sky being announced [on Wednesday].
"The company has just unveiled a new £25m production to be shot in Cardiff - A Discovery Of Witches for Sky 1 - meaning that the loan from Welsh Government has already generated significant new business and new jobs for Wales with more projects to follow in 2018 and beyond."
A Welsh Government spokesman said it no comment "on a commercial decision by a private company".


A fugitive who was recaptured four years after jumping from a court room dock may never be released from prison.

Andrew Moran, 34, from Salford, was rearrested in a raid on a luxury villa on Spain's Costa Blanca in 2013.
Moran leapt from the dock and assaulted four security guards at Burnley Crown Court in February 2009.
Moran, described as having a "premier league criminal lifestyle" was given an indeterminate sentence and jailed for public protection.
Judge Norman Wright, sitting at Liverpool Crown Court, said Moran posed a real danger to the public and will only be released when the parole board consider him safe.
Describing him as "ruthless, deceiving and cunning", he imposed a minimum tariff of eight years and 236 days.
"I have come to the conclusion that you are dangerous," the judge told Moran.
He had previously been sentenced for threatening Royal Mail guards with a gun, machete and baseball bat in Colne, Lancashire, in May 2005.
Moran went on the run after escaping from court and travelled to Paris, Monaco, Thailand and Italy before settling in Spain.
The judge said the raid in Colne was carried out with "military precision and discipline".
He added that 11 years after the robbery, the ferocity of the attack still lives with injured security guard James Hodkinson.


An Irishman who suffered devastating brain injuries after undergoing surgery as a teenager is set to receive a settlement of at least 10m euros (£7m).

Eoin O'Mahony, now 32, had two operations at Cork University Hospital in 2001 after complaining of headaches during his final year at school.
Days later, he lapsed into a coma-like state and now has locked-in syndrome.
His family took a case against the Health Service Executive (HSE), seeking a settlement to cover his future care.
Liability had already been conceded in the case, according to the Irish broadcaster, RTÉ.
Friday's hearing was the latest in the family's long-running court battle with the Irish state to secure funds to meet Mr O'Mahony's extensive healthcare needs.
Dublin's High Court was told his disability is so extreme that he cannot even use his finger to press a button if he needs help.
"No financial award can bring back Eoin and his family to a life of fullness and achievement he had every reason to aspire to," the judge said.
Over the last five years, Mr O'Mahony has already received interim payments totalling 4.1m euros (£2.8m) to cover his care needs.
But after 13 years of litigation, his parents asked for the case to be finalised with a lump sum payment that would meet the cost of their son's future care requirements.
The judge said the case had been "enormously long" and complex.
He added that he intends to award Mr O'Mahony a final settlement of at least 10m euros when he makes a final ruling on the case in October.


Warwickshire had the better of a rain-hit opening day against Nottinghamshire at Edgbaston as Boyd Rankin claimed centre stage in a mid-afternoon burst.

After Keith Barker's breakthrough at 76-2, Ireland and England international Rankin then took three wickets in 24 balls to leave Notts on 125-6.
The whole of the evening session was lost when the rain arrived at tea.
Notts' only bright spot was opener Jake Libby, who lasted over three hours for a determinedly gritty 59.
Both teams made one change from their last Championship match, in the pace bowling department. The Bears brought in Mark Adair for only his second Championship game in place of Oliver Hannon-Dalby, while Nottinghamshire's Luke Fletcher replaced Harry Gurney (bruised heel).
After choosing to bat, Notts moved slowly in the morning session as the ball swung in humid conditions, and reached 71-2 at lunch from 32 overs.
The impressively economical Rikki Clarke broke through in the ninth over when he hit Steve Mullaney's off-stump before Michael Lumb, having made just 10 in 62 minutes, misread spinner Jeetan Patel's arm-ball to be trapped lbw.
After facing 117 balls to bat through the session for 37, Libby speeded up a little after lunch. But, after Brendan Taylor lofted a catch to long leg, Riki Wessels edged a brute of a ball from Rankin to wicketkeeper Tim Ambrose.
Then, after seeing Samit Patel also get caught behind, Libby, who started this season on loan with Northamptonshire, became the third player to be caught by Ambrose off the bowling of Rankin. It earned the Irishman impressive figures of 3-25 from his 14 overs.
Warwickshire fast bowler Boyd Rankin told BBC WM:
"I'm pleased with how I bowled. I've been feeling pretty good in the last few weeks. I bowled pretty well against Lancashire but just didn't get wickets.
"We kept them to two runs per over pretty much all the whole time. All the guys bowled well but it was just my day to take a few wickets.
"The pitch is quite slow and it's not really doing much off the deck. It is a little bit tacky but hopefully it will flatten out a bit for when we come to bat."
Notts head coach Mick Newell told BBC Radio Nottingham:
"I thought there'd be a bit more pace in the pitch. It was quite difficult to score off the medium quick bowlers, then Boyd Rankin stepped it up a little bit.
"He was quicker than everybody else. He bowled a very good spell in the middle of the afternoon which put under some serious pressure.
"Jake Libby batted very well. He started very well for Northants. Now this is a step up coming into Division One and facing a high-quality attack like Warwickshire. It's a big challenge for him. He's made some 20s and 30s and will be pleased to have made a fifty. Now he'll be looking to kick on again."


A prestigious award for graphic novelists in France is facing calls for a boycott after its long list of nominees failed to include any women.

The 42-year-old Grand Prix at Angouleme has long faced criticism for its failure to recognise women cartoonists.
This year, a pressure group is calling for a boycott, saying "it is no longer tolerable" that "renowned female creators" are left off the list of 30.
At least three male nominees have publicly backed the protest.
They have asked for their names to be removed from the list.
The Grand Prix is a highly prestigious prize, recognising the lifetime achievement of a cartoonist. It is handed out each year at the Angouleme International Comics Festival.
In its long history, only one woman, Florence Cestac, has ever won the prize.
A group called BD Egalite, or Women in Comics Collective Against Sexism, said the prize was significant, because as well as being honorary it could also boost an artist's career and book sales.
"What is the message sent to women cartoonists and those in the process of becoming such?" it asked on its website. "We are discouraged from having ambition, from continuing our efforts. How could we take it otherwise?
"It all comes back to the disastrous glass ceiling. We're tolerated, but never allowed top billing. Will we require women in comics to perpetually play second fiddle?"
A number of cartoonists on the long list have since asked for their names to be removed.
American Daniel Clowes called it a now "totally meaningless 'honor'."
"What a ridiculous, embarrassing debacle," he added.
Riad Sattouf on Facebook listed a number of female cartoonists he would "prefer to cede my place to", including Rumiko Takahashi, Julie Doucet, Anouk Ricard, Marjane Satrapi and Catherine Meurisse.
The Festival's Franck Bondoux was quoted in French media as saying that Franco-Belgian graphic novels, known as "bande desinee", had traditionally been dominated by men.
"The festival cannot distort this reality, although I concede that the list might contain one or two female names," he said.
But he rejected accusations that the festival ignored the contribution of women artists, giving examples of steps it was taking to promote their work.


Finance Minister Máirtín Ó Muilleoir has denied knowing about a back channel of communication between a Stormont committee's chairman and a witness.

He was responding to calls to step aside during an investigation into how Stormont's finance committee chairman handled its Nama inquiry.
Daithí McKay resigned as a Sinn Féin MLA last week amid claims he coached a loyalist blogger before his appearance.
Jamie Bryson implicated Peter Robinson as benefitting from the Nama deal.
The then first minister of Northern Ireland and former leader of the Democratic Unionist Party strongly denied he had sought to benefit in any way from the £1.2bn property deal.
A special meeting of the finance committee is to take place on Tuesday morning to discuss the ramifications of Mr McKay's resignation.
Leaked Twitter messages between Mr Bryson, Mr McKay and Sinn Féin member Thomas O'Hara were obtained last week by the BBC's Nolan Show and The Irish News.
Mr Ó Muilleoir, who was on the committee, was directly referenced in one direct message from Thomas O'Hara's Twitter account to Mr Bryson's which said: "I'm trying to establish what Máirtín or someone could jump on and say there's no way we can turn him (Jamie Bryson) away, this is credible, relevant and in the public interest."
Ulster Unionist Leader Mike Nesbitt and Alliance deputy leader Naomi Long have called for Mr Ó Muilleoir to step aside during an investigation, which Sinn Féin has said it would welcome.
But Mr Ó Muilleoir said attempts to link him to the scandal were "no more than petty party politicking".
"I had no part in or knowledge of these inappropriate communications," he said.
The finance minister insists he is going nowhere. Máirtín Ó Muilleoir says he was in the dark about the private messages exchanged with Mr Bryson and was astonished his name was mentioned in the conversations with the loyalist.
There is no clear timeline yet for the investigation into the matter by the Assembly Standards Commissioner.
But MLAs on the current finance committee are expected to reconvene as soon as Tuesday to discuss the ramifications of Daithí McKay's resignation.
The National Assets Management Agency (Nama) is the Republic of Ireland's "bad bank", set up to deal with toxic loans after the 2008 property crash.
It sold its Northern Ireland loans portfolio to a US investment firm for £1.2bn in 2014.
The Stormont inquiry was set up last year to investigate an allegation made in the Dáil (Irish parliament) that a politician or political party in Northern Ireland stood to profit from the loan sale.


Sinn Féin Culture Minister Carál Ní Chuilín has accused the DUP's Gregory Campbell of "pure ignorance"  in the Northern Ireland Assembly.

The clash came during a debate on the Irish language and Ulster Scots.
When invited to speak by principal deputy speaker Mitchel McLaughlin, Mr Campbell replied: "Curry my yoghurt can coca coalyer".
In Irish, the phrase "go raibh maith agat, Ceann Comhairle" means "thank you, speaker".
Mr Campbell then asked the minister about a minority languages strategy.
However, Ms Ní Chuilín refused to answer the question, saying that Mr Campbell's behaviour was not "befitting a member of the assembly".
"If it's anything to go by what you just did, we don't need a strategy for pure ignorance," said Ms Ní Chuilín.
In a later tweet, Ms Ní Chuilín said that she had complained to the speaker's office about "Gregory Campbell's mockery of the Irish language".
Rosie McCorley MLA, Sinn Féin Irish language spokesperson, said: "Unfortunately this is nothing new from the DUP who have blocked the development on an Irish language act, and whose representatives have a long history of insults to the Irish speaking community.
"While this might be funny in Gregory's little closed world, it is hugely insulting to all of those who promote the huge benefits of endorsing and enhancing bilingualism in our society especially in our children."


Transfer deadline day promises to be as busy as ever and you can follow all the latest on BBC online, television and radio.

The transfer window closes at 23:00 BST on Monday in England and Scotland, with major European leagues also having a deadline of 1 September.
At each end of the professional football spectrum, from Arsenal to York and Barcelona to Partick Thistle, this is how you can follow every transfer on the BBC.
Follow our live text commentary from 07:00 BST on your computer, tablet or phone via the BBC Sport website or app all the way through to the bitter end.
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We will bring you the latest news, views, speculation and done deals from our reporters around the country and worldwide.
Our transfers page - which will also be available on Red Button - will capture every move, while each club page will be updated with the latest transfer stories concerning that club.
As well as the Premier League, Football League and Scottish Premiership, we will also be tracking the big moves in Europe and beyond, including the main ins and outs in Spain's La Liga, Italy's Serie A, Germany's Bundesliga and France's Ligue 1.
We will be holding votes throughout the day on our live text page.
You'll be able to follow all the deadline-day deals via the @BBCSport account on Twitter and share your views using the hashtag #bbcdeadlineday.
There will also be updates throughout the day - as well as the opportunity to give your reaction  - on our Facebook and Google+ pages.
Our reporters, who will be across the country monitoring every move, will also be sharing their photos from behind the scenes on the BBC's Instagram page.
There will be regular transfer updates throughout the day on the BBC's national and regional radio stations up and down the country.
BBC Radio 5 live will also monitor the final few hours of the transfer window with a special deadline day edition of 5 live Sport, which will be hosted by Mark Chapman.
He will be joined from 19:00-23:30 BST by a number of guests, including former footballers Danny Murphy, Jason Roberts and Phil Neville.
They will be accompanied by John Motson, British journalists Rory Smith and Jonathan Wilson, sporting director/chief scout Tor-Kristian Karlsen plus European football journalists Gabriele Marcotti, Raphael Honigstein and Andy Brassell.
The BBC's World Service will also be tracking the big deals from around the globe, with reporters in Europe, Africa and South America.
Dan Walker will present a transfer deadline day special edition of Football Focus on BBC One from 23:35 until 00:15 BST (00.35-01.15 BST in Northern Ireland).
He will be joined by Danny Murphy, Jason Roberts and Phil Neville to round up the day's events.
Walker and our team or reporters will bring you the latest transfer news throughout the day via the Red Button, which can also be viewed via the BBC Sport website.
Media playback is not supported on this device
A deadline day special will run from 13:00 to 00:15 BST and feature regular updates from the BBC Sport centre in Salford.
There will be regular transfer news on national and regional television stations across the country as well as BBC World.
The News Channel will broadcast a 30-minute transfer deadline day edition of Football Focus at 18:30 BST, presented by Walker, that will also be streamed on the BBC Sport website. Guests will include Murphy and Roberts.
It will also have a 22:45 BST bulletin and show the late-night Football Focus until midnight.
BBC World News will have bulletins at 17:43, 20:43 and 23:00 BST.
You can read the latest news, listen to 5 live and watch the TV coverage via the BBC Sport app on your smartphone or tablet.
It is available from Google Play for Android devices, the App Store for apple devices, and the UK Amazon Kindle Fire Appstore.


The Autumn Statement - the government's second big economic statement of the year - has significant implications for your finances.

Philip Hammond described this statement, his first as chancellor, as a plan to ensure the UK economy is "match-fit".
It included major announcements on housing, benefits and tax.
So what does it mean for you?
Salary sacrifice - dubbed by some as middle-class perks - allow some employees to give up some of their salary in exchange for goods and services. This lowers their income tax and national insurance bill because their salary is effectively lower.
The most popular use is for pensions, childcare vouchers and bicycles in the cycle to work scheme - all of which will be unaffected, as will employees getting an ultra-low emission company car.
However, other items bought under the scheme such as computers, gym membership, and health screening will be subject to tax from April 2017. In effect, salary sacrifice will be cancelled on these other items and will prevent people lowering their tax bill with their use.
This could prompt a closing-down sale of these deals before the new rules take effect.
A new savings bond will be launched through National Savings and Investments, with an interest rate expected to be set at about 2.2%.
The bond will be open to those aged 16 and over, subject to a minimum investment limit of £100 and a maximum investment limit of £3,000. Savers must put in their money for three years.
The equivalent best-buy three-year bond on the market now pays interest of 1.62%.
The new product will be available for 12 months from spring 2017. The chancellor said he expected two million people to benefit.
Savings experts described it as an "underwhelming" offer, pointing our that by the time the bond launches next year, interest rates - and returns for savers - may be higher than they are now.
Separately, there will be a limit on the amount of money people can recycle in pensions. Some draw cash from their pension pot tax-free, then put some back into a pension again to get extra tax relief.
To do this, the chancellor plans to reduce the annual tax-free allowance from £10,000 to £4,000 in April 2017 for those who start to take money from their defined contribution pension pot.
The idea is they will have less money to play with to recycle it. This is likely to affect a small number of people, but could cause problems for those who may need to access their pension pot flexibly and find they subsequently would like to put the money back.
Fuel duty will be frozen for a seventh year.
The chancellor said this would save the average car driver £130 and the average van driver £350 a year.
While motorists will benefit from the fuel duty freeze, the cost of vehicle insurance may rise as the Insurance Premium Tax will rise from 10% to 12% in June 2017.
That may also affect the price of home cover and other insurance products.
Insurance companies are furious, pointing out that this is the third rise in this tax in 18 months.
The AA said: "The chancellor has created the illusion of being the motorists' friend with a freeze on fuel duty whilst pickpocketing drivers on Insurance Premium Tax."
Hannah Maundrell, of money.co.uk, said: "Yet another hike in Insurance Premium Tax seems crazy as it will add £51 to the average household's insurance bill. The cost of insurance is expected to rise anyway - this will make it so much worse."
Measures had already been announced planning to cut whiplash claims, which it is hoped will cut car insurance premiums by about £40.
UK economy 'resilient' despite £122bn hit
Autumn Statement latest updates
Key points at-a-glance
Fewer than two-thirds of the population own their home in much of the UK, with increasing numbers renting as house prices rise.
The typical home in the UK costs £218,000, according to the latest official figures - a rise of £16,000 on a year earlier. First-time buyers would need to find an average deposit of about £33,000 for a mortgage on such a property.
The chancellor said that for many home ownership "remains out of reach", with a pressing need for affordable housing.
He committed to increase funding for home building, with a £2.3bn Housing Infrastructure Fund to deliver infrastructure for up to 100,000 new homes in high demand areas, and £1.4bn towards the construction of affordable homes.
This will take time to increase supply into the housing market. At present, experts say that a lack of homes on the market is pushing up house prices.
Some huge changes to the benefits system, announced by Mr Hammond's predecessor George Osborne, are already in place.
The main working age benefits and tax credits were frozen in cash terms for four years from April 2016. That includes entitlements such as jobseeker's allowance and income support. That income freeze could coincide with an acceleration in inflation, pushing up the cost of living and adding pressure to those on low incomes.
Cuts had also already been announced to Universal Credit - the new umbrella benefit gradually being introduced across the UK.
The chancellor is offering some partial respite by changing the so-called taper rate.
This means for every £1 someone on Universal Credit earns in work over the work allowance (the amount you can earn without your benefit being affected), Universal Credit will be reduced by 63p instead of the present level of 65p.
The Resolution Foundation said this would save claimants up to £300, but previous cuts may have cost them more than £2,000.
Mr Hammond said that no more welfare cuts would be announced during this Parliament - but that a cap on welfare spending would remain.
The government is introducing a new tax relief to help those who buy and sell on a small scale, such as on internet auction sites or at car boot sales. From April 2017, the first £1,000 a year of income will not be taxable.
There will be similar relief for the first £1,000 of property income, such as from letting your room via a website.
The National Living Wage will rise from £7.20 to £7.50 in April, for those aged 25 and over. This is a smaller rise than had been predicted earlier in the year.
Public sector pay has already been set at a 1% annual rise each year until 2019-20.
Lettings agents in England will be banned from charging upfront fees to tenants. This will happen "as soon as possible", the chancellor said.
These fees can cost hundreds of pounds and include charges for references, to secure a tenancy, and even a deposit for those wishing to have a pet.
The cost will be shifted to landlords, as is the case in Scotland. The argument is that they have the power to shop around for the cheapest agent when letting out their property.
Charities have welcomed the plan, but the Association of Residential Letting Agents (Arla) described it as "a draconian measure".
Cold calls offering exotic investment opportunities to people cashing in their pension pots will be banned.
Advice services and legitimate companies said such calls had "plagued" the pensions world for years.
The ban, which could be enforced with fines of up to £500,000, will not cover texts and emails.
Announcements in previous Budgets and Autumn Statements include:


German police have arrested a 51-year-old man after a crate of grenades from World War Two blew up in his garage.

Police were called to the address in Hennef, western Germany, on Monday after an explosion was reported.
Firefighters arrived to find the man's garage in flames and more ammunition went off as they tried to put it out.
The owner, a private collector, said he had bought the munitions at a flea market.
Reports suggest the force of the explosions threw objects up to 10m (32ft) into the air.
No injuries were reported, but homes near the scene were quickly evacuated.
The nearby Highway 560 and a stretch of railway were both closed as bomb experts feared more munitions could go off.
Experts were called to secure the remaining grenades and destroy them via a controlled explosion in a field.
German media quoted police as saying the grenades had probably been triggered by unseasonably warm temperatures.
The collector now faces possible weapons charges over the incident.


The Belgian authorities have reduced the threat level in Brussels from its highest level of four to three.

The city was locked down for nearly a week, with schools, universities, and the metro system closed and soldiers deployed on the streets.
The alert was raised after fears of a Paris-style attack. Some of the Paris suspects lived in Brussels. At least one, Salah Abdeslam, is still at large.
130 people were killed in the Paris attacks and more than 360 wounded.
Police in Belgium have mounted a number of raids and searches over the past two weeks and have charged five people with terror-related offences.
Belgian Prime Minister Charles Michel stressed that the threat of an attack in Brussels remained "real" and "serious", but said the "imminent nature" of the threat was "no longer present".
"We can confirm that the Threat Analysis Coordination Agency re-evaluated the threat level from four to level three," a spokesman for the Belgian crisis centre said.
The reduction to level three lowers the perceived threat from "serious and imminent" to "possible and likely", bringing Brussels in line with the rest of the country.
The lowering of the threat level came as a surprise, since the government had said that it would probably keep the highest threat level in the capital through the weekend.
Everyone is hoping that this is not the new normal, with armed police outside the school gates and soldiers in combat fatigues patrolling through shopping centres and railway stations.
The government says there is still a threat and it must be taken extremely seriously, but discontent with the way the situation has been handled is growing.
So there are many people still feeling a little nervous, in a city that is more accustomed to bureaucratic bungling than the threat of terrorism.
Fearful Brussels tries to leave lockdown behind
On Sunday night, Belgian police carried out a series of raids that the government said were linked to a possible imminent attack. No firearms or explosives were found, however, and 15 of 16 people detained were released on Monday.
On Thursday, fire crews and decontamination teams attended a major mosque in Brussels after a suspicious powder was discovered. The white powder turned out to be flour.
In Berlin, police arrested two suspected Islamists on Thursday after searching a mosque in the city.
The raid in the city's Charlottenburg district was aimed at investigating an "actual threat," police said.
German newspaper Bild reported that there were indications an attack was being planned at the mosque. Special forces in black uniforms were deployed during the operation and the building was sealed off.
How the Paris attacks are affecting Muslim children
Who were the Paris attackers?
Interview transcript: 'My brothers were manipulated, not radicalised'
Special report: In-depth coverage of the attacks and their aftermath


A 28-year-old woman has died in a two-car crash in Huddersfield.

Police, who were in Lockwood on another call-out, attended the crash between a VW Polo and a Vauxhall Corsa on Woodhead Road at 23:00 GMT on Sunday.
The woman was declared dead at the scene. Another woman was taken to hospital with injuries not thought to be life-threatening.
Woodhead Road was closed from Station Lane to Taylor Hill Road for investigations.
Sgt Ann Drury, of West Yorkshire Police, said: "We are appealing for witnesses who may have seen this collision or either vehicle prior to the collision to contact us.
"There was also an earlier collision at this location involving a Renault Clio and I would ask anybody who witnessed that collision to also come forward."


The head of the body tasked with destroying Syria's chemical weapons says fighting is preventing access to sites through some rebel-held areas.

Ahmet Uzumcu, of the Organisation for the Prohibition of Chemical Weapons, called for local, short-term ceasefires to allow experts to work.
Syria officially joined the Chemical Weapons Convention on Monday.
Meanwhile, three of the six Red Cross workers who were kidnapped on Sunday have been freed, the ICRC has said.
A Syrian Red Crescent volunteer who was with them has also been released, the group added. All those freed are reported to be unharmed.
By Paul AdamsBBC News
For almost two months, the world has fixated on the relatively narrow issue of Syria's chemical weapons, while the war has raged on, unchecked.
In his BBC interview, Ahmet Uzumcu voiced the hope that his team's work might act as a catalyst towards a wider political process.
Not surprisingly, for someone who clearly has chemical weapons on the brain much of the time, he also used the word "precursor".
Only a determined optimist would suggest that there's a clear line between ridding Syria of weapons of mass destruction and a comprehensive peace settlement.
But the unprecedented level of US-Russian cooperation which led to an agreement to deal with the former offers a faint glimmer of hope for the latter.
Syria weapons: Peace hopes raised?
The seven workers were seized near the town of Saraqeb in Idlib province, where they were delivering aid and assessing health facilities.  It is not clear who carried out the kidnapping.
The OPCW and the UN have had a team of 60 experts and support staff in Syria since 1 October. They are based in Damascus and have been carrying regular visits to facilities.
In his first interview since the OPCW won the Nobel Peace Prize last week, Mr Uzumcu told the BBC's Today programme that Syrian officials had been co-operating and facilitating the experts' work.
He said they had been taken wherever they wanted to go, and that they had already reached five out of at least 20 facilities capable of producing chemical weapons.
However, Mr Uzumcu said, routes to some of the sites went through opposition-held territory and this prevented access.
"They change hands from one day to another, which is why we appeal to all sides in Syria to support this mission, to be co-operative and not render this mission more difficult. It's already challenging," he said.
He said he had called for truces because "in the previous, UN-led mission to investigate allegations of use [of chemical weapons] there were temporary ceasefires of four or five hours which helped this mission".
He added that one abandoned site was located in a rebel-held area, and that his team was hoping to access it.
It is the first time the OPCW has worked in a war zone since it was set up in 1997.
Mr Uzumcu also said that on Saturday mortar shells had fallen "next to the hotel where our team is staying and there are exchanges of fire not far from where they go".
Details of the visits have not been released. Syria is believed to possess mustard gas, as well as the sarin and VX nerve agents.
Meanwhile, US Secretary of State John Kerry has said a peace conference should be held in Geneva as soon as possible to set up an interim government.
"There has to be a transition government in Syria to permit the possibility of peace," he said.
The dominant group in the main opposition alliance, the Syrian National Council, has said it will not take part in the proposed peace negotiations - known as Geneva II.
In his interview with the BBC, Mr Uzumcu said the Nobel prize had been a "very big boost" to the morale of his teams. "They are working in very challenging circumstances in the field," he said.
The OPCW, based in The Hague, was established to enforce the 1997 Chemical Weapons Convention. Its main role to monitor and destroy chemical weapons.
Syria's chemical weapons stockpile
How to destroy Syria's chemical arsenal
Q&A: Syria disarmament deal
Syria chemical attack: What we know
The disarmament deal on Syria's chemical weapons was sparked by a poison-gas attack in Damascus on 21 August in which hundreds were killed. Western nations blamed the forces of President Bashar al-Assad, but he blamed rebel fighters.
Syria later agreed to join the global Chemical Weapons Convention, and the UN said it would bound by the treaty from 14 October.
Under a UN resolution, Syria's chemical weapons production equipment must be destroyed by 1 November and stockpiles must be disposed of by mid-2014.
Violence in the country is continuing. On Monday a car bomb killed at least 12 people in the north-western rebel-held town of Darkoush in Idlib province, activists say.
The attack came a day after seven workers of the International Committee of the Red Cross were abducted near Saraqeb, a town also located in Idlib province, near the Turkish border.
Syrian state TV blamed rebels for the abduction.


An increase in the number of women playing sport has driven improved participation figures, according to the latest survey by Sport England.

People regularly playing sport stands at 15.74 million over 12 months, a rise of 1.65 million since 2005/06.
Bucking the normal trend, the number of women playing sport and being active is increasing faster than men.
Swimming remains the top sport overall but continues to decline, with athletics a close second and rising.
Sport England's Active People Survey began in 2005/06 and measures the number of people taking part in sport across the nation, with findings published every six months.
There was good news for tennis, cricket, boxing and rugby union, with increases in the numbers taking part but football and cycling experienced falls.
Participation figures for lower socio-economic groups and disabled people were low and remain static.
"It's good news that more women are playing sport, and driving an overall increase in the numbers," said Jennie Price, Sport England's chief executive.
"It's particularly great to see This Girl Can is making a real difference. That's because we've really focused on what drives women's attitudes and behaviours.
"If we're to see a further step change in the total number of people playing sport, we need to take a similar, consumer-focused approach in areas where the figures are stubbornly low, like disability and lower socio-economic groups."


Labour MP Chuka Umunna has said he is running to become Labour leader.

He made the announcement by posting a video on Facebook as he met activists in Swindon.
The Streatham MP and shadow business secretary is the second candidate to formally declare in the race to succeed Ed Miliband, who quit last week.
He said he had spoken to around 40 Labour candidates who lost out to Conservatives in target seats at the election before deciding to stand.


A motorcyclist who died in a crash in Northumberland has been named by police.

Shaun O'Connell, from Throckley, died when his Honda motorbike and a blue Ford S-Max car crashed on the A696 near Kirkwhelpington near Otterburn.
The vehicles collided at about 09:10 BST on Thursday and the 33-year-old was pronounced dead at the scene.
In a statement Mr O'Connell's family said they were "devastated". The car driver is in a stable condition.
"We are a motorbike family - we all love to go out on the bikes and this was just an ordinary day. Sadly everything has now changed," Mr O'Connell's family added.
Northumbria Police is continuing to appeal for witnesses.


A wave of selling sweeping across bond markets resumed on Monday as investors continued to digest the impact of a Donald Trump presidency.

US and European bond prices have sunk in expectation that he will enact inflationary policies that speed the pace of interest rate rises.
On Monday, some bond yields - which rise as the price falls - hit their highest for more than six months.
Bonds globally lost $1.29tn (Â£1tn) last week, according to Bank of America.
And there is no sign that the bond sell-off is easing, depressing the value of some pension investments and making it more expensive for countries and companies to borrow money.
On Monday, the 30-year US Treasury jumped above 3% for the first time since January. In the UK, the 10-year gilt yields returned to levels not seen since June's Brexit referendum vote. And German 30-year bunds rose above 1% for the first time since early May.
Italian bonds have been among the most affected. Rome's 10-year yields rose four basis points to 2.01% on Monday, their highest in 14 months.
"It is a continuation of this recent trend. There are still these expectations that inflation could go up if the US takes a more expansionary fiscal stance," said DZ Bank strategist Daniel Lenz said.
Jim Cielinski, head of fixed income at Columbia Threadneedle, said the sell-off trend was not surprising, but the "ferocity of the reversal" was.
And in a research note for Societe Generale, analyst Daniel Fermon said that rising interest rates may not be a good thing.
"As central banks are now less active in the bond market and Trump expects to cut taxes and launch a $1tn infrastructure investment plan, increasing the deficit, we believe rising US long-term rates remain a major risk for financial markets," he said.
Investors had piled into bonds, seeking a safe - but low - rate of return during what has been years of sluggish growth in the US, Europe and Japan.
But since inflation and interest rates are seen as likely to rise, investors are seeking assets with a more attractive return. With a Trump administration promising economic stimulus through spending and tax cuts, investors are worried about putting money into low fixed-payment assets, such as bonds.
That has fuelled share markets since last Wednesday's election result.
Wall Street's Dow Jones index closed at another record high on Friday, in the wake of Mr Trump's unexpected victory. European markets have also risen, and at midday on Monday, the FTSE 100, Cac-40 and Dax were all slightly higher. Earlier, Japan's Nikkei index hitting a nine-month high, closing up 1.7%.
Bond yields are up in the eurozone's financially stressed countries, such as Italy, Spain and Portugal and the moves have been quite pronounced over the last few days.  Rising government borrowing costs were one of the central features of the region's financial crisis. So are we are looking at a re-run?
There are three important differences to keep in mind. Those borrowing costs are still well below crisis levels. At the time, a rule of thumb for whether a bailout was needed was ten-year government borrowing costs of more than 7%. Italy has just gone over 2%, Portugal is 3.5%. And it's happening to them all.
Even ultra-safe Germany has seen its government bond yields rise, although they are much lower than Italy's. And the impetus is coming from outside, from political events in the US. Still, it is clear that Europe still has its weaknesses, especially in some countries' banks - Italy and Germany's Deutsche Bank most notably.
The dollar has also strengthened against major currencies. The pound fell 1.1% to $1.2464. Currencies in many emerging markets - from the Mexican peso and Malaysian ringgit, to Turkey's lira and South African rand - fell on fears that protectionism and higher US interest could suck investment from these markets.
"Clearly the market has settled on a 'buy dollar' theme, on the basis there will be a debt-fuelled US fiscal binge that will push up inflation," said TD Securities' European head of currency strategy Ned Rumpeltin.
"There are signs that higher bond yields and the knock of a stronger US dollar are having a domino impact, taking down the weakest risky assets first, before moving on to the next," said Deutsche's global co-head of foreign exchange, Alan Ruskin.
And a senior European Central Bank (ECB) has warned that the uncertainty caused by sudden swings in the financial markets threatened economic recovery.
Speaking in Frankfurt on Monday, ECB vice-president Vitor Constancio said: "We should be cautious in drawing hasty, positive conclusions from those market developments, because they may not necessarily indicate that the world economy will have an accelerating recovery with higher growth."


We hope Claire Perry knows what she's letting herself in for.

For the Rail Minister is asking passengers in East Anglia for comments about the service they receive and how it could be made better, which in our neck of the woods is surely asking for trouble.
Let's face it, rail travellers are a forthright breed, who will not pass up on an opportunity to express an opinion about their regular commute.
"The view of passengers are critical to improving services," says Mrs Perry. "We really do want to hear from people about their views and we really hope we get a good response."
Words she might come to regret.
"It is a comprehensive consultation document that includes some challenging questions. These things can be very unwieldy but I've tried to cut it down to make it very pertinent."
The consultation comes as the government starts to draw up the tender for the new Greater Anglia franchise, which will start in October 2016.
The government knows what MPs and the local business community think; they have fought a very successful lobbying campaign which culminated in the Transport Secretary promising to upgrade the main London to Norwich line at some stage in the future.
But up until now passengers haven't really had a say.
The consultation will last until March 16th and asks passengers for their views on a range of subjects.
It acknowledges that "the current rail service in East Anglia has remained unchanged for many years" and promises that the new franchise will "ensure that the service meets the needs of passengers and businesses in an important region of the UK which contributes significantly to the UK economy".
Regular travellers may let out a hollow laugh when they read the claim that " the Government is forging ahead with plans to reduce journey times between Norwich and London to 90 minutes". While a few improvements will be made next year, most of the serious spending isn't likely to happen until after 2019.
But if they can get through that, they will find 19 questions to answer.
Some are fairly predictable: What should be the key priorities of the new franchise, how many trains an hour should there be, do passengers value cross country services like the one between Norwich and Liverpool?
But there are also some fairly contentious ones: Should first class seating be removed to allow more space for standard class passengers and should there be more staff on duty at stations and on the trains?
And there are a couple of questions which are guaranteed to get respondents going.
"Are there any examples of outstanding customer service experiences which you believe the East Anglia rail franchise should  aspire to?"
Or how about this one: "How can the franchise operator help you better during planned and unplanned disruption?"
Passengers could have a field day with that after a year that's seen a catalogue of problems on the main line through Essex, Suffolk and Norfolk.
Government consultations are normally responded to by local politicians and a handful of pressure groups but already social media has been buzzing with suggestions and comments about this one.
Mrs Perry is likely to have a lot of reading to do.


The husband of a woman  murdered on their honeymoon in Mauritius has offered a reward of 2m Mauritian rupees (£44,000) for information.

John McAreavey offered a sum that is almost twice the average annual salary when he spoke at a news conference in Port Louis, Mauritius, on Tuesday.
He appealed to people to come forward about the death of his wife, Michaela.
He said they had felt "let down" and even "betrayed" by a process that, he said, had failed them.
Michaela was strangled in a hotel while on honeymoon on the island six years ago.
It is rare for rewards to be used in Mauritius, but Mr McAreavey said he believed something needed to be done to break the deadlock in the case. He wants those who killed Michaela, 27, to be brought to justice.
Mr McAreavey told journalists at the conference that, over the past six and half years, Michaela's family's resolve to win justice for her remained "undiminished".
"We believe we have given the Mauritian authorities every chance to deliver on their very public promise that justice would be done," he said.
"However, until this visit, the reality falls far short of that and as the years have passed, it appears that the unofficial policy has become one of 'out of sight - out of mind.'
"But we have no intention of just slipping out of mind or sight. Michaela deserves justice and we intend to get it. We should not have needed to make this very painful return journey."
He said that, quite bluntly, they had felt "let down time and time again".
"We take some comfort from the assurances given by the prime minister yesterday that Michaela will get justice, but to achieve that we need the help of those who may know something, but have not yet come forward for whatever reason," he said.
The family hopes that the substantial reward they are offering, will send "a powerful message" about their determination to get justice.
"As time marches on this could be our final chance to obtain justice for Michaela, but we can't do it alone. We need the help of the people of Mauritius. Please help us as our fight goes on," he said.
Mr McAreavey said if  he had to come back to Mauritius again and again, he would do it.
On Monday, he met Prime Minister Pravind Jugnauth after police told him an elite task force was now working on the investigation into his wife's murder.
Mrs McAreavey, 27, was found strangled in a bath at a luxury hotel 12 days after her wedding in January 2011.  Two hotel workers were tried for murder, but found not guilty in 2012.
Mauritian police launched a fresh investigation following the trial, but it came to nothing.
Mr McAreavey has travelled to Mauritius with his sister, Claire, and Mark Harte, Michaela's eldest brother, saying he was prepared "to go to the ends of the earth to ensure that justice is achieved for Michaela".
Mr McAreavey remarried in September last year.


A fire which broke out a special school in Wrexham is believed to have been caused by a light fitting overheating.

Four appliances from Wrexham, Chirk and Llangollen were called to St Christopher's School in Hightown, at 02:10 BST on Saturday.
North Wales Fire and Rescue Service said the cause was under investigation but it is thought to be accidental.
The firefighters said the roof of the school was "well alight" when they arrived.
The school provides education for children with special educational needs, with about 280 pupils.


Graduates in technical and engineering subjects would be given £10,000 to join the armed forces, under plans unveiled by the Liberal Democrats to tackle recruitment problems.

The Lib Dems also pledged to keep defence spending at the Nato benchmark of 2% of national income.
Leader Tim Farron said he believed in a "credible" armed forces.
Labour and the Conservatives have both pledged to stick to the 2% Nato spending target.
The Lib Dems have also promised a new "careers for heroes" scheme to pay for the full cost of further and higher education for armed forces personnel who had served for 12 or more years.
"A recent independent report was a damning indictment of armed forces recruitment and retention, with some units facing 14% shortfalls in manpower," said Mr Farron.
"Our Army, Navy and Airforce deserve the best and the brightest serving in them, and we must not stand by as those who have served face disadvantages."
On Sunday's Andrew Marr Show Defence Secretary Michael Fallon said the government could not force people to join the Army.
"We don't have conscription in this country, the Army has to compete with other sectors in the economy," he said.
The Conservatives have broken their 2015 pledge to not let the size of the army fall below 82,000 - it currently stands at 78,500.


Forensic work is to begin next week in the search for an IRA victim whose body has been missing for almost 40 years.

The Independent Commission for the Location of Victims' Remains (ICLVR) said a 'geophysical survey' will be carried out on land not previously searched at a bog in Oristown, County Meath.
It is believed Brendan Megraw's remains are buried somewhere on the land.
He was one of the 16 murder victims that became known as the Disappeared.
Mr Megraw was 23 years old when he was abducted from Twinbrook in Belfast in 1978, and murdered by the IRA.
There have been three unsuccessful searches for him, the most recent in 2010.
His brother, Kieran Megraw, said the family were wary of getting their hopes up.
"You're thankful that information has come in," he told BBC Radio Ulster's Good Morning Ulster.
"But you have to temper your expectation and hope. You're hoping then the results of the survey will say it's okay to go ahead."
The IRA claimed that he had confessed to being a British provocateur and Military Reaction Force undercover agent.
Senior forensic investigator Geoff Knupfer told Good Morning Ulster that the latest search was a "continuation" of the previous efforts to find Mr Megraw.
"We've undertaken two or three phases previously. They're all adjoining one another which would indicate to you and your listeners that we've been told where to go, where to look and, really, it's a continuation of that process."
He added the chances of finding Mr Megraw were "not enormous" but that he was "optimistic" if the grave area has not been disturbed.
He said: "No-one, least of all Brendan's family, is under any illusion that this is anything other than a huge task.
"We will carry out an initial survey of ground that is on the site where we think Brendan could be buried, but has not previously been analysed.
"This will involve a team of forensic archaeologists using ground-penetrating radar to try to identify anomalies beneath the surface that may warrant further investigation and a fresh search."
The ICLVR was established in 1999 to obtain information in strictest confidence which may lead to the location of the remains of the Disappeared - those killed and buried in secret by banned paramilitary groups prior to 10 April 1998 as a result of the Troubles.
Information passed to the ICLVR is kept confidential and cannot be used in criminal proceedings.
The ICLVR said that over four hectares of the Oristown bog have been searched to date, with a further 2.5 hectares to be covered by the new land survey.
Two other victims - Kevin McKee and Seamus Wright - both from west Belfast and abducted in 1972, are thought to be buried nearby in Wilkinstown.


Two Israeli policemen have been killed and a third wounded in a shooting attack near a sacred site in Jerusalem.

They were shot by three Israeli Arabs close to the compound known to Jews as the Temple Mount and to Muslims as Haram al-Sharif (Noble Sanctuary).
Police chased the attackers into the site and shot them dead.
There has been a wave of stabbings, shootings and car-rammings of Israelis predominantly by Palestinians or Israeli Arabs since late 2015.
Two of the previous attackers were Jordanians.
Police say the three men who carried out Friday's attack were aged between 19 and 29 and came from the northern Israeli city of Umm al-Fahm.  Israel's Shin Bet security agency said that they were not previously known to the security services.
Police say the gunmen opened fire as they made their way from the Temple Mount/Haram al-Sharif towards Lions' Gate, an opening in the Old City walls about 100ft (30 metres) away.
The attackers were then pursued back to the compound, where they were killed.
Mobile phone footage showed at least one of the attackers in a confrontation with members of the security forces in the holy site before being shot.
The two policemen who died of their injuries in hospital were named as Advanced Staff Sergeant Major Kamil Shanan, aged 22, and Advanced Staff Sergeant Major Hail Sattawi, who was 30. They were Druze from Israel's northern Galilee region.
Tom Bateman, BBC's Jerusalem correspondent
The Old City has often been a flashpoint in the conflict, which since the autumn of 2015 has seen an increase in violence involving attacks often carried out by lone individuals.
But an attack with guns by multiple assailants in the vicinity of the heavily guarded holy site, a very sensitive location, is highly unusual in recent times.
And the confirmation from Israel's security agency that the attackers were Israeli Arab citizens of Umm Al Fahm, and not previously known to the authorities, will also cause concern about the ability of Israel to prevent such incidents.
For the Israeli government, the event has crossed "red lines" and there will be fears of an increase in tensions following the severity of the attack and the rare decision to close the site.
Israeli Prime Minister Benjamin Netanyahu said it was "a sad day in which our Druze brothers pay the heaviest price in our joint mission to protect the security of our country. I salute them and their heroism".
Palestinian Authority President Mahmoud Abbas condemned the attack in a phone call to Mr Netanyahu, the prime minister's office said.
Mr Netanyahu has previously accused the Palestinian leader of failing to denounce such attacks.
In the wake of the incident, police sealed off the site to search it for weapons. It is the first time in decades that the compound, which contains the Dome of the Rock and al-Aqsa Mosque, has been closed for Muslim Friday prayers, which normally draws thousands of worshippers.
The site is administered by an Islamic authority (Waqf), though Israel is in charge of security there. Police are investigating how the attackers managed to smuggle in a handgun, sub-machine gun and knife.
The Palestinian Grand Mufti of Jerusalem, Mohammad Hussein, who had urged worshippers to defy the closure, was detained by police, but later released.
His son said the cleric was not facing any charges over his call for Muslims to converge on Jerusalem.
Elsewhere, a Palestinian was shot dead in clashes with Israeli forces at a refugee camp near Bethlehem on Friday, Palestinian sources said.
Barra Hamamdeh, 21, was killed during a raid by troops on the Dheisheh camp, the Palestinian Wafa news agency reported.
The Temple Mount/Haram al-Sharif is the holiest site in Judaism and third holiest in Islam and is one of the most politically sensitive sacred places in the world.
It is located in East Jerusalem, occupied by Israel since the 1967 Middle East war. Israel considers the entire city its sovereign capital, while Palestinians claim East Jerusalem as the capital of their sought-after future state.
Israel's Public Security Minister Gilad Erdan said the attack was "a serious and severe event in which red lines were crossed", adding that security arrangements in and around the site would be reviewed.
No group has said it was responsible, though the militant Palestinian Hamas movement, which runs the Gaza Strip, praised the attack as a "natural response to the Zionist ongoing crimes".
The shooting comes weeks after an Israeli policewoman was killed in a knife and gun attack outside the Old City by three Palestinians from the occupied West Bank.
Forty-four Israelis and five foreign nationals have been killed in nearly two years of such attacks.
At least 255 Palestinians - most of them attackers, Israel says - have also been killed in that period, news agencies report. Others have been killed in clashes with Israeli troops.
Israel says Palestinian incitement has fuelled the attacks. The Palestinian leadership has blamed frustration rooted in decades of Israeli occupation.


Apple is widely expected to launch a smaller version of the iPad later on Tuesday, into what is becoming an increasingly crowded tablet market.

The launch will be watched by fans keen for a cheaper device while detractors will see it as another test for chief executive Tim Cook.
Demand for smaller tablets have been proved by the success of Amazon's Kindle and Google's Nexus 7.
The event in San Jose, US, kicks off at 10:00 local time (17:00 GMT).
Most analysts agree that the price of the pocket-sized iPad will be key to its success.
Currently Apple's 9.7in iPad 3 has a starting price of $499 (£399 in the UK) while its iPad 2 can be bought for $399 (£329).
To date, Apple has sold more than 84 million iPads, with the device accounting for 26% of Apple's third quarter revenue.
The new mini iPad is expected to shave a couple of inches from its larger cousin with analysts predicting a "sweet spot" price of about £200.
That would make it an "affordable Christmas present", said Maciej Gornicki, an analyst at IDC.
The risk for Apple, said Ovum analyst Adam Leach, will be cannibalising its existing iPad range.
23 Oct: Apple (San Jose)
Expected to unveil a 7-8in iPad
24 Oct: Samsung (New York)
Will give details of US launch of Galaxy Note 2
25 Oct: Microsoft (New York)
Launch event for Windows 8 which goes on sale, alongside Surface tablets, the next day
29 Oct: Google (New York)
Android-themed event, may include new Nexus devices
29 Oct: Microsoft (San Francisco)
Launch of Windows Phone 8 operating system
30 Oct: Arm (London)
Mobile device chip designer and "partners" announce news
"If an iPad customer wants to upgrade will they still go high end?" he asked.
A survey of 1,000 consumers by US firm Baird Equity Research suggested that, on average, consumers would be prepared to pay $242 (£150) for a 7in iPad and $268 (£167) for an 8in model.
Amazon's new 7in Kindle Fire HD costs $199 (£129 in the UK). A slightly larger version, shipping on November 20, will sell for $299 (£159). Google's Nexus 7 has a price tag of $250 (£159).
The launch of the mini iPad will be keenly watched by Apple critics who have questioned whether the firm has lost its edge since the death of Steve Jobs.
The fact that, unlike previous product launches, there is little doubt about what is coming could be significant, thinks Mr Leach.
"It represents a change in the way Apple go to market and the way people perceive Apple. It is a move away from how Steve Jobs did things. It is being headed, dare I say it, more like a normal technology company," he said.
Two years ago when mini tablets began to hit the market, Steve Jobs famously said that in his opinion they would not succeed because the size was insufficient to "create great tablet apps".
That Apple has changed its mind represents another important "sea change" for the company, thinks Mr Leach.
"Apple is now in the role of following what the market is doing, responding to the threat of the Google Nexus and the Kindle Fire," he said.
While internally Apple may be regretting losing its image as a market leader, it could be good news for consumers, thinks Paddy Smith, editor of Stuff.tv.
"Having buckled under public pressure to increase the size of the iPhone's screen, Apple can now be seen once again creating a product based on listening to its customers, rather than thinking it always knows best.
"We think a smaller iPad - with a lower price tag - is a sure-fire Christmas hit. And Apple knows it, too," he said.
Boosted by its new iPad, Apple will continue to dominate the tablet market, predicts IDC. It said that Apple will hold a 68% share of the market in 2012, compared to 29% for Android tablets.
Both will fall off slightly next year with the launch of Windows 8 tablets, IDC said.


A spectacular view of the South East from space was sent back to earth by astronaut Tim Peake on New Year's Eve.

"Looks like some fine weather for #England and #France for tonight's fireworks!" he said in a tweet.
The astronaut is sending regular tweets to 300,000 followers on Twitter from the International Space Station (ISS), where he is based for six months.
The father-of-two from Chichester in West Sussex arrived at the ISS on 15 December.
His time at the station will be spent conducting scientific experiments.
The astronaut is becoming well-known for his light-hearted tweets from space.
On Christmas Eve, he sent an apology after dialling a wrong number from space and saying to a woman on the other end of the line: "Hello, is this planet Earth?"
He said it was not intended to be a "prank call".


Senior Conservatives have accused the Bank of England and the Treasury of "peddling phoney forecasts" to scare people into voting to stay in the EU.

Former chancellors Lord Lamont and Lord Lawson and ex-Tory leaders Iain Duncan Smith and Lord Howard said "startling dishonesty" had been displayed.
They said George Osborne's warning of spending cuts and tax rises after a Leave vote was "born of desperation".
Remain dismissed "yet more fantasy economics from the Leave campaign".
Elsewhere in the EU referendum debate:
The Leave campaign has faced a string of warnings from the government and financial bodies about the implications of a vote to leave the EU on 23 June.
The Treasury has claimed a Leave vote would tip the UK into a year-long recession, while Bank of England governor Mark Carney has said the risks of leaving "could possibly include a technical recession".
Hitting back, the four Conservatives said: "There has been startling dishonesty in the economic debate, with a woeful failure on the part of the Bank of England, the Treasury, and other official sources to present a fair and balanced analysis.
"They have been peddling phoney forecasts and scare stories to back up the attempts of David Cameron and George Osborne to frighten the electorate into voting Remain."
How trade and the UK's economy are affected by membership of the EU.
They said the main risk for the UK was remaining "locked to a doomed eurozone".
On Wednesday, Mr Osborne sparked anger among his Leave-backing colleagues when, alongside his Labour predecessor Alistair Darling, he said an emergency Budget would be needed if the UK voted Out.
He listed examples of the measures that could be required including hikes to income tax and cuts to the NHS, saying leaving the EU would be an "irreversible" step causing "financial instability" and leaving the UK "with no economic plan".
This prompted 65 MPs to sign a letter claiming the chancellor's position would be "untenable" if he tried to implement such measures.
In a letter to the Daily Telegraph on Thursday, the four senior Conservatives said Mr Osborne's warning was "nothing more than ludicrous scaremongering born of desperation".
They added: "No chancellor would seriously propose any such thing."
But a spokesman for the Britain Stronger in Europe campaign said: "This is yet more fantasy economics from the Leave campaign.
"The reason they don't want to listen to economic experts is because they are all agreed that leaving the EU would wreck our economy and hammer family finances.
"On 23 June, we can put our faith in economic experts across the globe who believe our economy is stronger in Europe or take a leap in the dark with the Leave campaign."


Mae nifer o'r Cymry oedd ym Manceinion wedi bod yn trafod eu profiadau personol wedi ymosodiad yn Arena Manceinion nos Lun.

Mae 22 o bobl a phlant wedi marw a 59 wedi eu hanafu yn y ffrwydrad.
Dywedodd yr heddlu fod dyn 22 oed, sydd bellach wedi'i enwi fel Salman Abedi, wedi tanio dyfais ffrwydrol, a'i fod ymysg y meirw.
Mae'r digwyddiad yn cael ei drin fel un terfysgol, ac mae dyn 23 oed wedi ei arestio mewn cysylltiad â'r digwyddiad.
Yn dilyn cadeirio cyfarfod o bwyllgor brys Cobra fore dydd Mawrth, dywedodd Theresa May mai hwn oedd yr ymosodiad gwaethaf i daro gogledd Lloegr erioed.
Digwyddodd y ffrwydrad yng nghyntedd yr adeilad tua 22:30 ar ddiwedd perfformiad gan y gantores Americanaidd, Ariana Grande.
Un oedd yn y cyngerdd oedd Vicky Pickavance a'i merch 12 oed Sadie o Fangor.
"Roedd 'na glec mawr, bang mawr ond dim byd fyswn i yn poeni am. O'n i yn convinced un balŵn oedd wedi popio, bod y plant yn sgrechian achos bod y balŵns wedi popio," meddai ar raglen y Post Cyntaf.
Dywedodd ei bod wedi gweld plant yn rhedeg a mwg ymhob man, ond doedd hi ddim yn gwybod bod ffrwydrad wedi bod yn yr arena tan yn hwyrach.
"Beth sydd wedi cael fi ydy bod pobl wedi marw, mae 'na bobl wedi marw yn y stadiwm yna, plant, rhieni....Dwi'n wallgo'.
"Dwi isio sgrechian ar rywun a does 'na neb i sgrechian ar."
Mae wyth o ysbytai ym Manceinion yn trin y rhai sydd wedi cael eu hanafu, ac yn Llundain, mae swyddogion gwrth-derfysgaeth yn cydlynu â'r Swyddfa Gartref wrth iddyn nhw ymateb i'r digwyddiad.
Mae pobl wedi bod yn defnyddio'r cyfryngau cymdeithasol i chwilio am unigolion sydd ar goll ac mae Heddlu Manceinion wedi cyhoeddi rhif ffôn arbennig ar gyfer unrhyw un sydd yn poeni am deulu neu ffrindiau allai fod yn yr ardal - 0161 856 9400.
Roedd Vanessa Brown o Fwcle yn y ddinas yn disgwyl am ei merch Emily a'i nai Benjamin i ddod allan o'r cyngerdd.
Dywedodd wrth raglen y Post Cyntaf: "Nes i ddechrau gweld plant yn rhedeg, a erbyn meddwl rwan mae'n debyg bod nhw'n rhedeg am eu bywydau, oherwydd bod nhw wedi clywed y bang.
"Eiliad wedyn o ni'n gweld Emily a Ben yn dod rownd y gongl - golwg erchyll ar wyneb Ben ac Emily yn torri ei chalon.
"Dyma fi'n agor y drws: 'Be sydd wedi digwydd?'
"Mae na bom, mae na bom, mae na bom!"
Fe geisiodd hi helpu merch oedd wedi brifo ei choes a dyna pryd wnaeth hi sylweddoli mawredd y digwyddiad.
"Nes i agor y car a dod a hi mewn i'r car a chlymu rhyw hen t-shirt oedd ganddon ni yn y bŵt rownd ei choes fel bod hi ddim yn gwaedu gormod.
"Ffonio ambiwlans a dyma pryd nes i sylweddoli bod o'n rhywbeth gwaeth. O ni methu mynd trwodd i'r ambiwlansys...
"Ac roedd na neb yn helpu'r hogan fach oedd yn cefn y car gyda fi. Nes i glywed plismon yn dweud, 'She's not life threatening' a gwnaethon nhw jyst pasio.
"Nath hynna neud fi sylweddoli wedyn ma rhaid bod na rai i fyny grisiau oedd yn life threatening."
Mae Sara Vaughan Perry yn byw ym Manceinion ers pum mlynedd.  Mae'n dweud y bydd pobl y ddinas yn "tynnu at ei gilydd".
"Mae 'na gymaint o ffrindiau a ballu, da ni wedi bod mewn cysylltiad bore ma. Mae pawb wedi dychryn ond da ni gyd yn dweud mae'n rhaid i ni gyd fod yn gryf."
Yn ôl Martin Morgan o ganolfan glustfeinio'r BBC doedd ymosodiad fel hyn ddim yn annisgwyl.
"Ar gyfrifon cefnogwyr y Wladwriaeth Islamaidd mae pobl wedi bod yn dathlu mae'n ddrwg gen i ddweud - dyw hyn ddim yn sôn bod nhw'n cymryd cyfrifoldeb.
"Mae'r heddlu a'r gwasanaethau diogelwch wedi bod yn ymchwilio ac arestio pobl yn aml iawn yn y blynyddoedd diweddar. Mae safon diogelwch, rhybudd diogelwch yn uchel iawn.
"R'on nhw'n disgwyl rhyw fath o ymosodiad."
Dywedodd Owain Myfyr o Ddolgellau wrth raglen Taro'r Post ei fod wedi mynychu'r cyngerdd nos Lun gyda'i bartner, a'i merch 12 oed.
"Roedden ni'n gwneud ein ffordd allan i ben y rhes, a dyma 'na glec ofnadwy," meddai.
"Do'n i erioed 'di teimlo rhywbeth tebyg, a'r ffaith bod y llawr 'di crynu, roedd rhywun yn amau'r gwirionedd.
"O fewn ychydig eiliadau, roedden ni'n edrych i lawr ar bethau, mi ddaru 'na banig dorri allan am 'chydig, roedd mwyafrif y gynulleidfa yn blant a ffans yn eu harddegau. Roedd rhai oedd wedi mynd allan i wynebu hyn, ddaru nhw redeg yn ôl... a dyma 'na banig mawr."
Dywedodd ei fod wedi cael y tocynnau i ferch ei bartner fel anrheg pen-blwydd, a'i bod "wedi cael noson arbennig" nes y digwyddiadau ar y diwedd.
"Mae llawenydd yn gallu troi'n hunllef mor sydyn mewn gwirionedd. Y panig oedd y peth cyntaf wrth reswm... ond y flaenoriaeth oedd gwarchod y ferch rhag gweld dim byd, a rhag cael unrhyw niwed, a thrio peidio panicio," ychwanegodd.
"Mae rhywun yn gwerthfawrogi pa mor lwcus 'dan ni, ac mae rhywun yn meddwl am y trueiniaid sydd wedi colli annwyliaid."
Bydd gwylnos yn digwydd yn sgwar Albert yng nghanol y ddinas am 18:00 nos Fawrth ac mae'r ymgyrchu gwleidyddol ar gyfer yr etholiad cyffredinol wedi ei ohirio.
Mae'r arbenigwr diogelwch, Lee Doddridge wedi dweud wrth BBC Radio Wales y bydd yr heddlu hyd yn oed yn fwy gwyliadwrus ar gyfer rownd derfynol Cynghrair y Pencampwyr yng Nghaerdydd.
"Yr adeg gwan fydd ar ôl y digwyddiad, pan fydd yr orsaf drenau efallai yn llawn o bobl, pobl yn ciwio.
"Fe fydd pobl yn gadael gyda'i gilydd tra bod y digwyddiad yn dod i ben a dyna pryd y bydd angen bod yn ofalus."


Inmates' lives could be at stake at a prison where concerns were raised about increasing levels of violence, an former convict has claimed.

The man, who served two sentences at Chelmsford Prison, said he saw inmates pouring boiling water on each other.
Last year, a report said "bullying, low-level violence, and disobedience by prisoners" had increased.
A spokesman for the prison service said there was a "zero tolerance approach to violence".
The former prisoner, who wished to remain anonymous, said during his first stay a few years ago, "there was a lot more order" and he felt "quite safe".
"Last time I was there I saw about three violent incidents. This time there was violence every day," he said. "The whole place was just a shambles."
The ex-convict described a prisoner-on-prisoner attack in which a young inmate had boiling water poured over him while he was asleep, before being beaten with a metal rod.
"I know people have committed crimes, and they deserve to do their time, but people's lives are at stake in there," he said.
"There needs to be more staff. On a typical day, you'd look around on the wing, and there'd be 30 men on the floor and one officer with you."
Last year's report, by Chelmsford Independent Monitoring Board, also raised concerns about the "loss of a large number of experienced supervising officers and wing officers" having a "significant negative impact on the care and safety of prisoners".
In response to the former prisoner's claim, a prison service spokesman said: "We have a zero tolerance approach to violence in prisons and it can lead to offenders having time added to their sentence.
"We keep staffing levels under review and responded to recent pressures by recruiting over 1,700 additional prison officers nationally."


Billy Godleman's third century of the season earned Derbyshire a healthy first-innings lead over Division Two leaders Notts at Trent Bridge.

Resuming on 52-2, the Derbyshire skipper added 112 for the third wicket with Wayne Madsen (56).
Luke Wood removed Godleman (121), but Daryn Smit (32) and Tom Taylor (32) helped the visitors to 363 all out.
Smit's stunning catch removed India Test batsman Cheteshwar Pujara to leave Notts 67-2, still 67 adrift at stumps.
Nottinghamshire assistant head coach Paul Franks told BBC Radio Nottingham:
"We are behind the game, let's not kid ourselves. I think Derbyshire have played better cricket than would belie their position in the table and we've not been at our best. Let's not hide from that.
"We didn't do enough yesterday with the bat to get into a position where we could then capitalise with the ball.
"We created a chance to dismiss Billy Godleman last night and didn't take it and he made us pay with a hundred, so credit to them for building a very good first innings score and they are now putting us under pressure."
Wayne Madsen told BBC Radio Derby:
"We've competed well yesterday and today. We are happy that we are now in a position where going forward we have a decent chance in this game if we play some good cricket tomorrow and on Monday.
"We knew we wanted to start well and get as close to their score as possible, but if we could get through the first hour with no damage, then good; and that's what we did.
"Our partnership set us up for the day and we were able to take it past them."


A man has been hit by a bus on a Swansea road where two other people have been killed in similar incidents.

Paramedics treated the man following the incident on The Kingsway at 13:00 BST on Monday.
He was taken to Morriston Hospital with non life-threatening injuries. The road has since reopened.
Mother-of-three and police officer Sgt Louise Lucas, 41, died after being hit by a bus on the road earlier this year.
Daniel Foss, 37, from Reynoldston, Gower, also died after being struck by a bus on the road in September 2013.
A Swansea council spokesman said the authority has "introduced safety barriers on the Kingsway's central reservation that follow on from the introduction of 20mph limits and pedestrian signage last year."