Christopher Andrew. The Defence of the Realm: The Authorized History of MI5. London: Allen Lane, 2009. Most valuable for me on the Edwardian spy mania, but looks like a fun read for the rest of the thousand-odd pages.

R. V. Jones. Most Secret War: British Scientific Intelligence 1939-1945. London: Penguin, 2009 [1978]. A reprint of this important autobiography; no doubt it's been superseded as a history of the wizard war but at the time it was groundbreaking.

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