John le Carre converses with Mark Lawson about his fragmented childhood, life in the diplomatic service, working with Alec Guinness and his book A Most Wanted Man. Le Carre worked as an intelligence officer in the 1970s before turning to writing full time. His personal experiences during the Cold War informed a string of best-selling espionage novels including The Spy Who Came in from the Cold and Tinker Tailor Soldier Spy. He also wrote the corporate corruption thriller The Constant Gardener, which became a Oscar-winning film.