Whilst I don’t know if this is the full details or not (of the letter), there is an updated post on Tom Levitt’s website with regards to the Legg issues, it reads as below :
Legg enquiry on MPs’ expenses (19 October 2009)
Tom Levitt has agreed to repay to the House of Commons £389 as requested by Sir Thomas Legg. This is in respect of a sofa bed purchased in 2004 which Sir Thomas has deemed ‘extravagant’ even though the Fees Office approved it at the time. He said “Had I been asked to pay this balance at the time I would readily have agreed to do so.