When Jock Colville was a young member of the foreign office staff he was seconded to be assistant private secretary to the prime minister, then Chamberlain; and to his surprise was kept on when Churchill succeeded Chamberlain in May 1940. There was a talkative man hanging about at No. 10 — he supposed him to be a courtier-crony of the incoming prime minister — whose task, if any, was obscure to Colville, who only discovered later that this was the man who handled Churchill’s relations with the secret services.

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