Dirk Bogarde as Dr Simon Sparrow

James Robertson Justice as Sir Lancelot Spratt

Samantha Eggar as Delia Mallory

Barbara Murray as Iris Merchant

Mylène Demongeot as Sonia

Donald Houston as Major Tommy French

Dennis Price as Dr Blacker

Richard Briers as Medical Student (uncredited)

Fenella Fielding as Passenger on Train

Leo McKern as Harry Heilbronn

Reginald Beckwith as Meyer

Amanda Barrie as Rona

Marianne Stone as Cafe Waitress (uncredited)

Peter Butterworth as Ambulance Driver

Frank Finlay as Corsetiere

Ronnie Stevens as Hotel Manager

Ronnie Barker as Man at Railway Station Ticket Counter (uncredited)

Jill Adams as Genevieve

Bill Kerr as Australian Sailor

Paul Whitsun-Jones as Grimes

Michael Flanders as Bradby

Jessie Evans as Mrs Parry

Timothy Bateson as Mr Holly

John Bluthal as Railway Porter (uncredited)

Johnny Briggs as Medical Student (uncredited)

Denise Coffey as Food Seller at Railway Station (uncredited)

Ann Lynn as Mrs Whittaker

Rodney Cardiff as Student Doctor

Madge Ryan as Mrs Clapper

Margaret Boyd as Lady Willoughby

Jeanette Landis as Rosie

Michael Goldie as Physical Training Instructor

Joe Robinson as Sonja's Boyfriend

Derek Fowlds as Medical Student Gillibrand

Pauline Jameson as Ward Sister

David Weston as Dr Stewart

Barbara Hicks as Health Farm Receptionist (uncredited)

Ronald Lacey as Cafe Customer (uncredited)

Harry Landis as Man in Cafe (uncredited)