Andrew Garfield as Robin Cavendish

Claire Foy as Diana Cavendish

Hugh Bonneville as Teddy Hall

Tom Hollander as Bloggs Blacker / David Blacker

Miranda Raison as Mary Dawney

Dean-Charles Chapman as Jonathan

Diana Rigg as Lady Neville

Ed Speleers as Colin Campbell

Emily Bevan as Nurse Margaret

Ben Lloyd-Hughes as Dr. Don McQueen

Roger Ashton-Griffiths as Hospital Chaplain

Camilla Rutherford as Katherine Robertson

Penny Downie as Tid

Amit Shah as Dr. James Khan

David Wilmot as Paddy

Patrick Godfrey as Mr. Tolland

Steven O'Donnell as Harry Tennyson

Lorraine Ashbourne as First Woman

Rosie Cavaliero as Second Woman

Stephen Mangan as Dr. Clement Aitken

Kiera Bell as Ballroom Dancer (uncredited)

Honey Holmes as Robin's Bedside Guest (uncredited)

Ty Hurley as Ambulance Man (uncredited)

Harry Attwell as Mechanic

Mark Underwood as Patient 1 (uncredited)

Charlene Durrant as Nurse (uncredited)

Adam Ganne as German Hospital Official

Charles Streeter as Chief Medic Lyneham

Simon North as Wedding Guest (uncredited)

Jason Farries as Robin's Friend / Guest (uncredited)

Shane Griffin as Doctor (uncredited)

Jack Jenkins as Wicket Keeper (uncredited)

George Dawson as Polio Patient (uncredited)

Jason Grangier as Robin's Guest (uncredited)

Brian Gillham as Obstetrician - Kenya (uncredited)

Gary John Clarke as Garden Party Guest (uncredited)

David Louw as German Delegate

Mark J. Paterson as Robin's Guest (uncredited)

Jonathan Hyde as Dr. Entwistle

Sylvester Groth as Dr. Erik Langdorf

Marina Bye as Pamela Harris

David Butler as Estate Manager

André Jacobs as Governor

Terry Norton as Governor's Wife

Dallon Brewer as Jonathan Aged 2

Deacon Brewer as Jonathan Aged 2

Jack Madigan as Jonathan Aged 5

Frank Madigan as Jonathan Aged 5

Tom Turner as Rory Stewart

Harriet Turnbull as Little Girl

Harry Marcus as Jonathan Aged 10

Tony Caprari as Spanish Motorist

John Herbert as Spanish Priest

Aurelie Stratton as Spanish Woman

Adam Neill as Mr. Pickering

Ross Sambridge as German Receptionist

Norman Anstey as Conference Chairman

Dean-Charles Chapman as Jonathan age 22

Heather Nicol as Barmaid