Kenneth Connor
Gregory Adams
Acting
Charles Hawtrey
Michael Bean
Acting
Leslie Phillips
Alistair Grigg
Acting
Joan Sims
Sarah Allcock
Acting
Kenneth Williams
Edwin Milton
Acting
Hattie Jacques
Grace Short
Acting
Rosalind Knight
Felicity Wheeler
Acting
Cyril Chamberlain
Alf Hudson
Acting
Ted Ray
William 'Wakie' Wakefield, the Headmaster
Acting
George Howell
Billy Haig - Saboteur
Acting
Diana Beevers
Penelope 'Penny' Lee - Saboteur
Acting
Jacqueline Lewis
Pat Gordon - Saboteur
Acting
Roy Hines
Harry Bird - Saboteur
Acting
Carol White
Sheila Dale - Saboteur
Acting
Richard O'Sullivan
Robin Stevens - Saboteur
Acting
Lorna Henderson
Pianiste
Acting
Diane Langton
Schoolgirl
Acting
Francesca Annis
Schoolgirl (uncredited)
Acting