Stories from the intelligence agency’s hidden past, in some unlikely places. BBC Security Correspondent Gordon Corera reveals how GCHQ has been listening in for 100 years, starting just after the end of the First World War and through to the present day. We hear from people who worked at the listening station in Scarborough during the Second World War and the Cold War. And Gordon reveals the vital role played by the Scarborough station during the Cuban Missile Crisis.

Producer: Claire Read

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