He studied history at the University of Manchester under Lewis Namier:, and in 1951 became Namier's principal assistant for the History of Parliament.
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The historian David Cannadine, in the History of Parliament Trust's 2006 annual lecture on 21 November 2006, noted that while Wedgwood and Namier are predominantly responsible for the foundation of the History, they were quite contrasting characters (Wedgwood a gregarious and high-spirited English aristocrat of advanced Liberal views, Namier a Polish Jew who was joyless and a strong Tory).