Guy Burgess was a brilliant young Englishman who rose through the ranks of MI5 and MI6 during the Cold War. But as a member of 'The Cambridge Spies', he betrayed his country by regularly passing on highly sensitive secret documents to his Soviet handlers.Historian Andrew Lownie, author of 'Stalin's Englishman: The Lives of Guy Burgess' - a Guardian Book of the Year and The Times Best Biography of the Year - will talk about how Burgess was able to avoid exposure as a traitor to his country through his trademark charisma and a network of powerful political connections.