The film had been scheduled to have been shot on Cyprus but due to the troubles on Cyprus it was filmed in Italy,
Dirk Bogarde began filming four days after finishing shooting on King and Country (1964).
Major McGuire (Sir Dirk Bogarde) wore ribbons for the following medals: Military Cross, 1939-1945 Star, Africa Star, Defence Medal, War Medal 1939-1945, Korea Medal, and United Nations Service Medal for Korea. Lieutenant Colonel Park (Nigel Stock) wore ribbons for the following medals: Military Cross, 1939-1945 Star, Africa Star, France and Germany Star, Defence Medal, War Medal 1939-1945, and Korea Medal (and perhaps one other).