George Baker

Prof. Gottlieb

Felicity Devonshire

Cathy

Anna Bergman

Suzy

Peter Blake

John

Queenie Watts

John's mother

Hugh Lloyd

John's father

Ian Hendry

Uncle Rodney

Johnny Vyvyan

Jockey

Monika Ringwald

Naked secretary

Lindy Benson

Blonde wife (as Linda Benson)

Forbes Collins

Squire

Mary Millington

Choir Girl (uncredited)

Edward Kalinski

Benny

John Benson

Executive

Guy Standeven

Psychiatrist