Winston Churchill
Clemmie
King George VI
Elizabeth Layton
Neville Chamberlain
Viscount Halifax
Sir John Simon
Sir Anthony Eden
Clement Atlee
General Ismay
General Ironside
Arthur Greenwood
Sir Samuel Hoare
John Evans
Air Chief Marshal Dowding (as Adrian Rawlings)
Admiral Ramsay
Admiral Dudley Pound
President Roosevelt (voice)
Tom Leonard
Sawyers
Cabinet Secretary Bridges
Randolph Churchill
Diana Churchill
Mary Churchill
Sarah Churchill
Pamela Churchill
Lord Stanhope
Lord Kingsley Wood
Lord Londonderry
House of Commons Speaker
Ernle Hastings
Equerry
Reynaud (as Oliver Broche)
Daladier
BBC Producer
Actor
Abigail Walker
Alice Simpson
Marcus Peters (as Ade Haastrup)
Maurice Baker
Jessie Sutton
Young Girl on Tube
Agnes Dillon
Oliver Wilson
Margaret Jerome (as Joanna Neary)
Brigadier Nicholson
Ramsay Staffer
Reporter
Teenage Girl at Tube Map
Naval Map-Room Officer
Sybil
Sir Alexander Cadogan
AD Nicholl (Secretary #1)
W D Wilkinson (Secretary #2)
Christopher Wilson (Photographer)
Maid
Cook
Back Bencher
Cecil Beaton
Member of Parliament (uncredited)
Civilian (uncredited)
Labour MP (uncredited)
Sir Robert Tasker (uncredited)
Londoner (uncredited)
Duff Cooper (uncredited)
Ambassador (uncredited)
Speakers Assistant (uncredited)
Downing Street Passerby (uncredited)
WWII Sailor (uncredited)
Downing St. Civil Servant (uncredited)
Young Couple (uncredited)
Cabinet Minister (uncredited)
Downing St KB (uncredited)
MP (uncredited)
London Refugee (uncredited)
George the Cook (uncredited)
Self (archive footage) (uncredited)
Sentry (uncredited)
Houses of Parliament (uncredited)
French Girl (uncredited)
Soldier (uncredited)
Royal Marine Guard (uncredited)
Conservative MP (uncredited)
Businessman (uncredited)
Politician (uncredited)
John Parker (uncredited)
Radio Operator (uncredited)
Worker (uncredited)
Rear Admiral (uncredited)
British Soldier (uncredited)
Artist (uncredited)
French Dignitary (uncredited)
Conservative Front Bench MP (uncredited)
Army Liaison Officer (uncredited)
The Marquess of Hartington (uncredited)
Reporter (uncredited)
Opposition MP (uncredited)
Paramedic (uncredited)
Dowager's Son (uncredited)
Churchill's Security (uncredited)
Boy on Bike (uncredited)