GCHQ – John Ferris on the official history

Mattias Hessérus in conversation with John Ferris, the historian 'behind the enigma' of Britain's signals intelligence agency.
The GCHQ building in Cheltenham, Gloucestershire. Credit: David Goddard / Getty Images.
The GCHQ building in Cheltenham, Gloucestershire. Credit: David Goddard / Getty Images.
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