Prime Minister Gordon Brown is to repay more than £12,000 in expenses for cleaning, gardening and maintenance at his second home, his office announced on Monday.
The repayment comes after auditor Sir Thomas Legg wrote to all MPs to highlight concerns which have arisen during his inquiry into expenses paid out over the past five years.
Sir Thomas said that any claim over £2,000 for cleaning or £1,000 for gardening in any one year is excessive and should be repaid.
Mr Brown will subsequently pay back £12,415, including a £1,396 bill for painting and decorating from April 2006 that was inadvertently submitted twice.
In a statement, Mr Brown's office said: "Sir Thomas Legg has issued his provisional conclusions to MPs, asking for further information where necessary before concluding in December.
"Mr Brown has always supported this process and will cooperate fully and make the necessary repayment. Mr Brown's expenses have always been cleared by the House authorities as entirely consistent with the rules."
The statement added: "Mr Brown has always supported clearing up the problems associated with the failed system of the past.
"Sir Christopher Kelly will shortly recommend a completely new system and the establishment of the independent Parliamentary Standards Authority takes the setting and adjudication of allowances out of the hands of MPs so the problems of the past cannot happen again.
"Mr Brown looks forward to condemning the discredited old system to the history books. The review also alerted Mr Brown to a bill for painting and decorating of £1,396 from April 2006 that was inadvertently assigned by error to two quarters. This was not spotted or adjusted by the House authorities at the time. Mr Brown has apologised for this inadvertent error."
Meanwhile, Conservative leader David Cameron is to supply the Legg review with paperwork relating to a £218 overpayment he has already repaid. His spokeswoman said he had received his letter and would be replying on Monday.
The query is understood to be in regard to £218.91 in mortgage over-claims blamed, when they emerged earlier this year, on "an inadvertent administrative error" arising from changes to Mr Cameron's home loan arrangements.
The Opposition leader repaid the sum in June. His spokeswoman said all Conservative MPs should cooperate with the review and would be expected to abide by its final rulings on repayments. "Clearly MPs will have to comply with final recommendations," she said.
The Liberal Democrat leader Nick Clegg, on the other hand, has been asked to pay back £910 in parliamentary expenses for gardening costs at his second home.
In a letter to Sir Thomas, Mr Clegg said: "I note that you recommend that I make a repayment of £910 for gardening costs. On your advice, I have made this repayment to the Department of Finance and Administration today."
