A decorated wartime commando, Hopson joined the Foreign Service in 1945. He worked in IRD as an assistant to John Peck in the early 1950s. He became head of the department in 1958, replacing John Rennie.
- Richard James Aldrich, Espionage, security, and intelligence in Britain, 1945-1970, Manchester University Press, 1998, p.234.
- Paul Lashmar and James Oliver, Britain's Secret Propaganda War 1948-1977, Sutton Publishing, 1998, p.137.