With John Wilson. Marley is a feature length documentary about the life and legacy of the reggae superstar Bob Marley. David Hepworth, who saw Bob Marley live in London in 1975, reflects on the unexpected history the film unearths. Irvine Welsh discusses his prequel to Trainspotting, Skagboys. Mark Renton is set for university and an escape from working-class Edinburgh - but when his family falls apart and life in 1980s Britain gets too tough, heroin offers a different way out. Novelist Joanna Trollope is chair of the judges for this year's Orange Prize for fiction, and she reveals the decisions behind this year's shortlist, which was announced today. Simon Armitage discusses the Poetry Parnassus, an ambitious project to bring together poets from all the nations competing in the Olympics - and appeals for poets to come forward from the nations as yet unrepresented. Producer Stephen Hughes.