John Gilling Director Andre Morell Sir James Forbes Actor Diane Clare Sylvia Forbes Actor John Carson Squire Clive Hamilton Actor Alexander Davion Denver Actor Jacqueline Pearce Alice Mary Tompson Actor Brook Williams Dr. Peter Tompson Actor Michael Ripper Sergeant Jack Swift Actor Marcus Hammond Tom Martinus Actor Dennis Chinnery Constable Christian Actor Roy Royston Vicar Actor Peter Bryan Writer Anthony Nelson Keys Producer James Bernard Original Music Arthur Grant Cinematographer Chris Barnes Film Editing