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When Churchill was in opposition after 1945, he led the Conservative Party in a debate about the Health Service. As he listened to Aneurin Bevan’s opening speech, he called for some statistics about infant mortality ... [which were] supplied, copiously and accurately, by Iain Macleod, then working in the back rooms of the Conservative Research Department. But, in his speech, Churchill made only one bold and sweeping use ... [of Macleod’s detailed research]. Encountering MacLeod afterward, Churchill made the above statement. As cited in The Life of Politics (1968), Henry Fairlie, Methuen, pp. 203-204

http://en.wikiquote.org/wiki/Winston_Churchill#Post-war_years_.281944_-_1955.29