Cecil Parker

as Professor Canford

George Cole

as 'Flash' Harry Cuthbert Edwards

Joyce Grenfell

as Sergeant Ruby Gates

Eric Barker

as Culpepper-Brown

Thorley Walters

as Butters

Irene Handl

as Miss Harker-Parker

Dennis Price

as Gore Blackwood

Sidney James

as Alphonse O'Reilly

Julie Alexander

as Rosalie Dawn

Lloyd Lamble

as Superintendent Samuel Kemp-Bird

Raymond Huntley

as Judge Slender

Nicholas Phipps

as Major Hargreaves

Lisa Lee

as Miss Brenner

John Le Mesurier

as Minister of Education

George Benson

as Defence Counsel

Elwyn Brook-Jones

as Emir

Basil Dignam

as Army Officer

Cyril Chamberlain

as Army Captain

Michael Ripper

as Liftman

Mark Dignam

as Prosecuting Counsel

Monte Landis

as Octavius

Warren Mitchell

as Tailor

Clive Morton

as V.I.P.

Wensley Pithey

as Chief Constable

Liz Fraser

as WPC Susan Partridge

Bill Shine

as Usher

Edina Ronay

as Lavinia (uncredited)

Erica Rogers

as Bobbie (uncredited)