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. Show more
Peter Hennessy, the leading Whitehall watcher, tells the story of British state secrecy and explores the tension between official secrecy and more openness. Show more
Naomi Grimley looks at the D-Notice committee, where the government and media cooperate to keep national security secrets. But now in the internet age is it a relic from the past? Show more