UK MPs face expense queries
British MPs are facing a further challenge to their expense claims when Parliament resumes after the summer recess.
Many will receive letters from an official investigator who has been looking at MPs' claims dating from the past five years, the BBC has learnt.
The MPs will be asked to justify their claims, and may be asked to provide further evidence to back them up.
In an interview in the Daily Telegraph, Gordon Brown has said he thinks "the worst offenders" should be prosecuted.
International Development Secretary Douglas Alexander told the BBC that MPs had a duty to respond to the letters.
After the publication of hundreds of claims earlier this year, several MPs announced they would stand down.
It followed widespread public disgust after their expense claims were published in the Telegraph.
MPs were accused of extravagance, over-claiming and avoiding tax on home sales.
Several were found to have repeatedly "switched" their designated second homes, meaning they were able to refurbish both their homes at public expense.
Following the Telegraph's revelations, former senior civil servant Sir Thomas Legg was commissioned by Downing Street to examine the MPs' claims.