For almost a quarter of century, Sargent helped shape British policy towards Europe. Covering the period from 1926 to 1949, this study explores Sargent and Foreign Office responses during a tumultuous period which included the collapse of Weimar Germany, the rise of Fascism, the Second World War, Anglo-Soviet relations and the dawn of the Cold War. In doing so, it sheds light on an important but largely neglected historical figure in the study of twentieth century British foreign policy. The book will be of use and interest to scholars, students and general researchers in the fields of twentieth-century foreign policy, British history, diplomatic relations and Britain’s relationship with Europe.