The seventh Marquess of Londonderry (1878-1949) held government posts in Dublin, Belfast and London. Controversial in his own lifetime, he oversaw the early years of both the Royal Air Force and Northern Ireland, and he was attacked as a 'warmonger' for his role at the World Disarmament Conference held at Geneva in the early 1930s. Londonderry's subsequent venture into amateur diplomacy cemented his reputation as an arch appeaser of Nazi Germany. He corresponded throughout with important national and international figures and others of significance, including Winston Churchill, Neville...