Channel 4 has called on Ofcom, the broadcasting regulator, to investigate its "cash-for-access" sting on two former foreign secretaries following criticism from MPs.

The Independent Press Standards Organisation, meanwhile, has received no complaints about The Daily Telegraph's coverage, either from the politicians involved or from any third parties.

The Parliamentary Commissioner for Standards cleared Sir Malcolm Rifkind and Jack Straw and said the "damage" done to the former MPs could have been avoided if Dispatches and The Daily Telegraph had "accurately reported" the exchanges they had filmed.