A college principal and senior managers colluded to "feather their own nests" with nearly £850,000 of public funds and "deliberately withheld" official advice which called the payments into question, MSPs have heard.

Former Coatbridge College principal John Doyle, a member of his staff and five managers shared half of a £1.7 million severance pot between them when the college merged into New College Lanarkshire.

The remaining £850,000 was shared amongst 26 other people, in a case which Auditor General Caroline Gardner described as one of the most serious failures in governance she has ever encountered.

The Scottish Funding Council (SFC) was powerless to stop them and its concerns appear to have been deliberately withheld from the committee that signed off the payments, she said.

Despite universal outrage from Holyrood's Public Audit Committee, the principal and officials cannot be prosecuted and the money cannot be recovered.

SNP MSP Nigel Don said the case is a "particularly bad example of misuse of funds, deliberate withholding of information and of feathering one's own nest".

Ms Gardner said: "These are very serious failures of governance, amongst the most serious that I have seen in my time in this role.

"A case this egregious is unusual. What appears to have happened is the chair of the board and the principal worked together to achieve a certain outcome, with members of the remuneration committee not receiving the information they needed to make their decision, and not receiving the concerns that had been raised by the SFC.

"My professional judgement is that it was very unlikely to be an oversight.

"It was a deliberate withholding of information, as far as I am able to draw a conclusion from the evidence that is there.

"I understand New College Lanarkshire, when it took responsibility for the affairs of Coatbridge College, took legal advice on what action was possible to recover the funds and other action and were advised that that wasn't possible."

Ms Gardner said the SFC should monitor future remuneration packages closely.

"If that leaves a gap it would be worth exploring whether other remedies, including legal remedies, are needed," she said.

"I hope they wouldn't be. Most public servants don't behave like this most of the time, but occasionally a case like this comes along where the normal controls simply fail to have the effect intended.

"The new arrangements should mean that it couldn't happen, with the SFC now needing to approve severance packages before they are paid.

"I don't know whether it would be possible for that sort of collusion to prevent that control.

"I would like to be able to give the committee that assurance but I don't feel I can."

Fraser McKinlay, Audit Scotland's director of performance audit and best value, said: "One of the reasons this feels like it is in a whole different league in terms of the seriousness is that they had all of that information and traffic from the SFC saying, 'We have serious concerns about this and it would not be in line with good practice', and yet they still went ahead with it.

"At that point, when you have got some people intent on doing a particular thing, then every internal control in the world makes that quite difficult to stop.

"So we would never say to you this could never happen again."

MSPs called for the managers to be named and shamed.

Mr Don said "corporate criminal law is pretty awful" in Scotland if they cannot be prosecuted for corruption or fraud, and fellow SNP MSP Stuart McMillan accused them of "moral corruption".

Conservative MSP Mary Scanlon said she was "shocked" by the findings.

"It is one of the worst examples that I have seen where people take full advantage of a situation basically to line their own pockets," she said.

"Anyone in the public sector that has had to endure the pay freeze for three years will be pretty angry to see how these people were allowed to get away with it.

"We're all aware of cuts in the college sector, and this is money that could have gone to the chalk-face to help more students get a career.

"I have seen colleagues named and shamed on the front page of The Sun for claiming for a 48p pint of milk, and an SNP MSP for claiming for a £1.49 umbrella.

"We're looking at hundreds of thousands of pounds being taken out of the public system - why are these people not named and shamed in the report?"

Ms Gardner said the names of the individuals involved are in the public domain in Coatbridge College's annual report.

"I think calling witnesses to explain to you the circumstances that unfolded during 2013 would send a powerful signal," she said.

A New College Lanarkshire spokeswoman said she cannot identify the individuals involved.

"Issues concerning poor governance at Coatbridge College, with respect to the management of the voluntary severance scheme and other arrangements for senior staff, were identified during the audit process and due diligence exercise around the merger of Coatbridge College and New College Lanarkshire," she said.

"The responsibility to resolve the issues highlighted lay with the former Coatbridge College board of management. Coatbridge College subsequently merged with New College Lanarkshire on 1 April 2014."

In a statement following the committee, convener Paul Martin said: "The committee shares the deep concerns the Auditor General has about the handling of severance packages for senior staff at Coatbridge College.

"As a committee we are not prepared to view these deeply questionable decisions as historic, we are determined to get answers and to hold those involved to account.

"The committee will be requesting documentary evidence from a range of organisations and individuals ahead of requesting their attendance before the committee to answer the serious questions prompted by the Auditor General's report. We are also interested in hearing from anyone who has information directly relevant to this piece of work."

Shona Struthers, chief executive of Colleges Scotland, said: "It is important to recognise that these decisions taken on severance were made pre-merger by legacy colleges, and not by existing colleges.

"There are now sector-wide procedures and processes in place to effectively manage severance. We now have a new Code of Good Governance for Scotland's Colleges and there are requirements that the Scottish Funding Council has set out regarding how colleges should process severance payments.

"The SFC now also has the power to call to account any college which is non-compliant. In addition, since the Office for National Statistics reclassification of colleges as public bodies, colleges must now comply with the Scottish Public Finance Manual, which requires approval both for severance schemes and for any exceptional payments.

"We are confident that these steps will provide greater accountability and ensure value for money for public finances