Kenneth Connor
Gregory Adams
Kenneth Connor
Gregory Adams
Charles Hawtrey
Michael Bean
Leslie Phillips
Alistair Grigg
Joan Sims
Sarah Allcock
Kenneth Williams
Edwin Milton
Hattie Jacques
Grace Short
Rosalind Knight
Felicity Wheeler
Cyril Chamberlain
Alf Hudson
Ted Ray
William 'Wakie' Wakefield, the Headmaster
George Howell
Billy Haig - Saboteur
Diana Beevers
Penelope 'Penny' Lee - Saboteur
Jacqueline Lewis
Pat Gordon - Saboteur
Roy Hines
Harry Bird - Saboteur
Carol White
Sheila Dale - Saboteur
Richard O'Sullivan
Robin Stevens - Saboteur
Lorna Henderson
Pianiste
Diane Langton
Schoolgirl
Francesca Annis
Schoolgirl (uncredited)
Norman Hudis
Screenplay
Gerald Thomas
Director
Lionel Couch
Art Direction
Olga Angelinetta
Hairdresser
George Blackler
Makeup Artist
Gordon K. McCallum
Sound Recordist
Peter Rogers
Producer
Bruce Montgomery
Music
John Shirley
Editor
Reginald H. Wyer
Cinematography