Frank Launder Director, Producer, Writer Cecil Parker Professor Canford Actor George Cole "Flash" Harry Cuthbert Edwards Actor Joyce Grenfell Sergeant Ruby Gates Actor Eric Barker Culpepper-Brown Actor Thorley Walters Butters Actor Irene Handl Miss Harker-Parker Actor Dennis Price Gore Blackwood Actor Sid James Alphonse O'Reilly Actor Julie Alexander Rosalie Dawn Actor Lloyd Lamble Superintendent Samuel Kemp-Bird Actor Raymond Huntley Judge Actor Nicholas Phipps Major Actor Lisa Lee Miss Brenner Actor John Le Mesurier Minister of Education Actor George Benson Defence Counsel Actor Elwyn Brook-Jones Emir Actor Sidney Gilliat Producer, Writer Val Valentine Writer