SPY Historian Vince Houghton sat down with British author and journalist Sinclair McKay for a two-part SpyCast. In Part 1, Vince and Sinclair discuss the role played by the codebreakers at Bletchley Park in the Allied victory in the Second World War. The author of three books and numerous articles on the topic, McKay provides compelling historical insight into a subject that you only think you really know.