Alan Yentob meets acclaimed writer Margaret Atwood in Toronto and discovers how a childhood spent between the Canadian wilderness and the city helped shape her.

Sir Cameron Mackintosh was once a theatre stagehand on Drury Lane and is now a musical theatre impresario, with a career spanning 50 years and a catalogue of musical theatre hits to his name - including Cats, Les Miserables, Phantom of the Opera and Miss Saigon - and he is now about to launch the US hit musical Hamilton in London.