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.