Using recently released sources, this article offers a fresh perspective on the London ambassadorship of David K. E. Bruce in the years of Harold Wilson and Lyndon Johnson, 1964?68. Bruce's running of the US Embassy is examined, as are his views of the Anglo-American relationship. Further attention is given to his diplomatic management of the Anglo-American relationship in the context of the difficult personal relations between Wilson and Johnson and with regard to policy differences over the Vietnam War and Britain's position as a world power. It is argued that while Bruce did help to ease some of the personal strains between Wilson and Johnson, he was generally less significant to the White House than has previously been asserted. It is also contended that his vision of Britain joining the EEC, yet retaining extensive military commitments beyond Europe was not viable.