THE SNAPPY quote from the book of Numbers that the Victorians were so fond of – “And be sure your sin will find you out” – is, taken right out of context, a helpful way of looking at the apparently endless succession of stories about celebrities haunted by the sins of their past. There’s Andy Coulson, former News of the World editor, who is going to jail for 18 months for his part in the phone-hacking scandal. That trial, which included Rebekah Brooks, former Sun editor, and her husband Charlie, not only exposed in detail the tabloid practice of eavesdropping on other people’s phone messages, but for good measure revealed to an interested public the affair between Rebekah and Coulson – and her husband’s recourse to lesbian pornography.Then t