Lord MacKenzie of Framwellgate, the Labour peer and former head of the Police Superintendents’ Association, warned the Prime Minister not to try to wreck the inquiry. “The common ploy by criminals is to get their retaliation in first and make a complaint against the police to divert the attention of the authorities and put the heat on the police,” he told The Mail on Sunday. “But it rarely works. If Downing Street is considering attempting to do this, they are making a catastrophic mistake. ”