On Start the Week Andrew Marr talks to the award-winning director Kevin Macdonald whose films often focus on real events or people, from Touching the Void, to Marley. The filmmaker Roger Graef discusses the ethical issues in documenting real life. And the Indian writer Aman Sethi explores the margins of society with his study of the world of itinerant labourers in a Delhi market. Producer: Katy Hickman.