£400 a day to stuff envelopes

RBS WAS also recently exposed for paying contractors on the project £400 a day to stuff envelopes, typically a minimum wage role.

Under Ross McEwan, the lender, still 62 per cent owned by the Government, has pledged to cut costs and stamp out scandals.

Since the financial crisis, RBS has been dogged by a furore surrounding the misselling of payment protection insurance, mortgagebacked securities and the mistreatment of small businesses.

In addition, Mr McEwan has taken an axe to the RBS branch network as part of costcutting measures, resulting in hundreds of job losses.