Banks have 'questions to answer' over swap mis-selling MPs will today[Thursday] hold a debate in the House of Commons to discuss the issue of swap mis-selling by banks, including, Barclays, Lloyds Banking Group, HSBC, and Royal Bank of Scotland. The FSA is in the final stages of a review into how interest hedging products were sold to small businesses amid claims banks did not properly explain the risks leaving victims with hundreds of thousands and even millions of pounds in costs they were never warned about. The FSA has confirmed it will publish details of its review before the end of the month, as well as what further action it intends to take. The FSA's review followed an investigation by The Sunday Telegraph and The Daily Telegraph, which uncovered evidence of widespread mis-selling of complex interest rate derivatives by banks. In March, Barclays was forced to apologise to the FSA for demanding clients withhold information from the regulator. Barclays, Lloyds and HSBC have already settled claims of mis-selling brought by some customers. Bob Diamond, chief executive of Barclays, has admitted the bank had made "mistakes," but added that the number of complaints received was a "very small number." Sir Win Bischoff, chairman of Lloyds, and RBS chairman Sir Philip Hampton, have both sought to downplay the size of the potential claims, saying the number of mis-selling cases the banks faced.