Film maker George Carey has spent the past five years exploring the interlocking worlds of spying and the British establishment in a trilogy about famous traitors. His films on Kim Philby and George Blake have already gone out in BBC Four’s Storyville strand, and as he completes his film on Guy Burgess he discusses the challenges of making documentaries about the men who, for their different reasons, put Soviet communism before the society that had nurtured them. Featuring clips from the trilogy including ones from the upcoming film on Guy Burgess, followed by a Q&A.