Singer/songwriter George Michael breaks a year-long chat-show silence to appear tonight and perform his new single Amazing. The other guests are Dead Ringers impressionist Jon Culshaw and film and TV actor Bill Nighy. Director Stuart McDonald ; Executive producer Beatrice Ballard Bill Nighy picks his Desert Island Discs tomorrow at 11.15am on Radio 4, and The Impressionable Jon Culshaw is on Wednesday at 10pm on ITV1