LONDON (Reuters) -British Prime Minister Boris Johnson said he disagreed with the criticism levelled at him by one of his top aides who quit earlier on Thursday over remarks he had made about the leader of the main opposition party. During angry exchanges in parliament on Monday, Johnson accused Labour Party leader Keir Starmer of failing to prosecute Jimmy Savile, one of Britain’s most notorious sex offenders, during his time as Director of Public Prosecutions. He attempted to row back from those remarks on Thursday but Munira Mirza quit as his head of policy, saying he should have apologised…