Alastair Sim
Millicent Fritton / Clarence Fritton
Joyce Grenfell
P.W. Sgt. Ruby Gates
Hermione Baddeley
Miss Drownder
Betty Ann Davies
Miss Waters
Renée Houston
Miss Brimmer
Mary Merrall
Miss Buckland
Balbina
Mlle de St. Emilion
Jane Henderson
Miss Holland
Lloyd Lamble
Superintendent Kemp Bird
Richard Wattis
Manton Bassett
Guy Middleton
Eric Rowbottom-Smith
Arthur Howard
Wilfred Woodley
Michael Ripper
Albert Faning
Eric Pohlmann
The Sultan of Makyad
Noel Hood
Bilston School Mistress
Elizabeth Griffiths
Gladys
Cara Stevens
Sultan's Secretary
Jerry Verno
Alf - the Bookmaker
Jack Doyle
Assistant Trainer
Arthur Mullard
Henchman (uncredited)
Carol White
Schoolgirl (uncredited)
Barbara Windsor
Schoolgirl (uncredited)