Security Service file release October 2015: Discussion

Stephen Twigge head of modern collections at The National Archives in conversation with Professor Christoper Andrew former official historian of MI5 and author of 'The Defence of the Realm: The Authorized History of MI5', and Gill Bennett former chief historian of the Foreign and Commonwealth Office, discussing one of the most famous spy cases in history along with some other highlights from the release of Security Service files to The National Archives in October 2015.