'Fascinating . This monumental work completes the authorised picture of a century of British intelligence' BEN MACINTYRE, THE TIMES '[A] revelatory look at the world of GCHQ . There is much in the book that illuminates' Mark Urban,...

The definitive history of GCHQ, one of the world's most tight-lipped intelligence agencies, written with unprecedented access to classified archives. For a hundred years GCHQ - Government Communications Headquarters - has been at the...

You know about MI5. You know about MI6. Now discover the untold stories behind Britain's most secretive intelligence agency, in the first ever authorised history of GCHQ. For a hundred years, GCHQ - Government Communications Headquarters...