Organization Eastern Arts Association

Intelligence Corps (national service | 1945-1948)

North Thames Gas Board (1948-1957)

British Broadcasting Corporation (consultant and contributor | The Great War | 1964 | The Lost Peace | 1965-1966 | The Commanders | 1972-1973)

Churchill College, Cambridge (part-time keeper of the archives | 1977-1995)

Cambridge University (lecturer in defence studies | three years in the 1980s)

Council of the Royal United Services Institute for Defence Studies

East Anglian Writers Association