The senior Scotland Yard detective who led the cash-for-honours inquiry has said he was treated as a "political problem" by some of the people he investigated. MPs have been waiting for months to question Assistant Commissioner John Yates and at a tense meeting he told them he had not received as much co-operation as he had wanted from some witnesses and denied accusations that he had leaked information to political journalists during the inquiry. His 16-month investigation looked at allegations that people who loaned money to the Labour and Conservative parties had been offered honours. It did nott lead to any charges being brought.