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This week, we\u2019re delving into the hidden history of spies, intelligence personnel and secret agents with English Heritage\u2019s senior historian for blue plaques, Howard Spencer.\n\nFind out about six men and women whose exploits were crucial to British intelligence and, for some, to our endeavours in World War Two. In the past, their lives, work and achievements were shrouded in secrecy. But today, their service, contributions and memory are honoured through blue plaques at their former homes in London.\n\nTo read more of the stories behind our blue plaques, go to www.english-heritage.org.uk/visit/blue-plaques/blue-plaque-stories\nLearn more about your ad choices. Visit megaphone.fm/adchoices