Gary Oldman

Winston Churchill

Benjamin Whitrow

Sir Samuel Hoare

David Strathairn

President Roosevelt (voice)

Demetri Goritsas

Cabinet Secretary Bridges

Ben Mendelsohn

King George VI

Paul Leonard

Admiral Dudley Pound

Malcolm Storry

General Ironside

David Schofield

Clement Atlee

Kristin Scott Thomas

Clemmie

Ronald Pickup

Neville Chamberlain

Samuel West

Sir Anthony Eden

Philip Martin Brown

Sawyers

Stephen Dillane

Viscount Halifax

Joe Wright

Director

David Bamber

Admiral Ramsay

Lily James

Elizabeth Layton

Adrian Rawlins

Air Chief Marshal Dowding

Eric MacLennan

Tom Leonard

James Biddle

Executive Producer

Hilton McRae

Arthur Greenwood

Nicholas Jones

Sir John Simon

Richard Lumsden

General Ismay

Joe Armstrong

John Evans

Jordan Waller

Randolph Churchill

Alex Clatworthy

Diana Churchill

Mary Antony

Mary Churchill