How the intelligence agency changed direction after the end of the Cold War - and faced the challenges of the digital age. BBC Security Correspondent Gordon Corera becomes the first journalist allowed to record inside GCHQ's listening station at Bude, which has spied on global communications satellites for decades. Taking us from the Cold War, when GCHQ was quietly eavesdropping on the front lines in Berlin, to the current digital era, Gordon finds out how it has been forced out into the open.

Producer; Claire Read

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