Will Hay

Dr. Benjamin Twist

Martita Hunt

Lady Bogshott

Fewlass Llewellyn

The Dean

Mark Daly

Arty Jones

C. Denier Warren

Minister of Education

Will Hay Jr.

Clarence

Basil McGrail

Watson

Jacques Brown

Manager

Lewis Broughton

Dr. Simpson (uncredited)

Richard Todd

Extra in crowd scene (uncredited)

Clive Dunn

Minor Role (uncredited)

Lilli Palmer

Yvette

Graham Moffatt

Albert Brown

Peter Gawthorne

Col. Willougby-Gore

Charles Hawtrey

Septimus

Marcel Varnel