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Available for over a year

As part of Radio 4's Secret Britain series, Peter Taylor meets people who keep or have kept the darkest state secrets, to hear how it feels to live a life in the shadows: The Derry family who put their lives on the line for peace; the Muslim agent who spies on Islamist extremists; the mandarin charged with guarding Britain's secrets; and the Special Branch officer who infiltrated subversive revolutionary groups. Presenter: Peter Taylor Producer: Richard Knight.