When captured Nazi generals found themselves in Britain in the Second World War, they were probably surprised to be brought to a beautiful country house where they were wined and dined by a senior British aristocrat. But it was all a charade. Unbeknown to the generals, every single conversation they had was bugged and an army of translators and transcribers worked away in the basement below. The 'senior British aristocrat' who they suspected had Nazi sympathies was a fictitious character named after a whisky distillery, and the entire show was a genius plot by British Intelligence to squeeze out snippets of valuable information. In this episode, Helen Fry joined Dan Snow to reveal the extent of this remarkable operation, and the military strategy which was altered as a result of careless comments.