Berlin's espionage scale and duplicity

In a special event recorded in front of an audience at London's Royal College of Music Anne McElvoy talks to John le Carré to celebrate the 50th anniversary of his groundbreaking Cold War espionage novel, The Spy who Came in from the Cold. It's the book which brought him international fame and which was described by Graham Greene as 'the best spy story I have ever read'. He discusses his extraordinary childhood as well as the state of Britain today, and the revelations of whistleblowers such as Edward Snowden.