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Page last updated at 08:16 GMT, Tuesday, 30 March 2010 09:16 UK

Just what does happen inside GCHQ?

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The government's intelligence service, GCHQ, eavesdrops on communications around the world bit little is known about who works there or how it operates.

A BBC Radio 4 documentary, GHCQ: Cracking the Code, investigates how the secretive department carries out its daily activities.

Security correspondent Gordon Correra was given exclusive access to the elusive department.

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