Clifford Chance and Sullivan & Cromwell, two of Barclays' long-term legal advisers, are the law firms that have potentially taken home millions of pounds in fees for their work helping the UK bank conduct its internal review into Libor fixing.

In a statement from Barclays before former chief executive Bob Diamond's appearance in front of the Treasury Select Committee, the bank said it "has invested nearly £100m to ensure that no stone has been left unturned".