It is a question which might baffle the greatest minds in detective fiction: what happened to the Bishop of Southwark last Tuesday night? Was he mugged on the way home to Tooting from a pre-Christmas party at the Irish embassy? The Rt Rev Tom Butler, 66, one of the Church of England's most senior bishops and a pillar of Thought for the Day on the BBC Today programme, says he has no idea. Others say he was seen sitting in the back of a Mercedes chucking children's toys out of the window and announcing: "I'm the Bishop of Southwark. It's...