A pair of two-seat trainer Spitfires were camera platforms to achieve realistic aerial footage inside the battle scenes. Lieutenant Maurice Hynett, RN, on leave from duties at Royal Aircraft Establishment, Farnborough flew a number of Spitfire sequences in the film, including one of the opening scenes which features a single Spitfire in flight. A rare Hawker Hurricane XII had been restored by Canadian Bob Diemert, who flew the aircraft in the film. Eight non-flying Spitfires and two Hurricanes were set dressing, with one Hurricane able to taxi.