Michael Smith, former codebreaker and Sunday Times defence correspondent, is one of the world’s leading experts on Britain’s spies. He is the author of the number one bestseller Station X, Foley: The Spy Who Saved 10,000 Jews and Six: A History of Britain’s Secret Intelligence Service. His book The Secrets of Station X: How the Bletchley Park Codebreakers Helped Win the War (Biteback, 2011) has sold 30,000 copies.