cast
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Gary Oldman
Winston Churchill
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Stephen Dillane
Viscount Halifax
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Lily James
Elizabeth Layton
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Ronald Pickup
Neville Chamberlain
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Ben Mendelsohn
King George VI
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Kristin Scott Thomas
Clemmie
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Nicholas Jones
Sir John Simon
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Samuel West
Sir Anthony Eden
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David Schofield
Clement Atlee
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Richard Lumsden
General Ismay
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Malcolm Storry
General Ironside
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Hilton McRae
Arthur Greenwood
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Benjamin Whitrow
Sir Samuel Hoare
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Joe Armstrong
John Evans
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Adrian Rawlins
Air Chief Marshal Dowding
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David Bamber
Admiral Ramsay
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Paul Leonard
Admiral Dudley Pound
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David Strathairn
President Roosevelt (voice)
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Eric MacLennan
Tom Leonard
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Philip Martin Brown
Sawyers
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Demetri Goritsas
Cabinet Secretary Bridges
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Jordan Waller
Randolph Churchill
- Alex Clatworthy Diana Churchill
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Mary Antony
Mary Churchill
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Bethany Muir
Sarah Churchill
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Anna Burnett
Pamela Churchill
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Jeremy Child
Lord Stanhope
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Brian Pettifer
Lord Kingsley Wood
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Michael Gould
Lord Londonderry
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Paul Ridley
House of Commons Speaker
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Robin Pearce
Ernle Hastings
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Michael Bott
Equerry
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Olivier Broche
Reynaud
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Mario Hacquard
Daladier
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Pip Torrens
BBC Producer
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Edmund Wiseman
Actor
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Hannah Steele
Abigail Walker
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Nia Gwynne
Alice Simpson
- Ade Dee Haastrup Marcus Peters
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James Eeles
Maurice Baker
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Flora Nicholson
Jessie Sutton
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Bronte Carmichael
Young Girl on Tube
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Roisin O'Neill
Agnes Dillon
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John Locke
Oliver Wilson
- Jo Neary Margaret Jerome
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Richard Glover
Brigadier Nicholson
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Tom Ashley
Ramsay Staffer
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Joshua Higgott
Reporter
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Imogen King
Teenage Girl at Tube Map
- Miles Gallant Naval Map-Room Officer
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Faye Marsay
Sybil
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John Atterbury
Sir Alexander Cadogan
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James Harkness
AD Nicholl (Secretary #1)
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Joshua James
W D Wilkinson (Secretary #2)
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Charley Palmer Rothwell
Christopher Wilson (Photographer)
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Patsy Ferran
Maid
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Sarah Flind
Cook
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Steffan Donnelly
Back Bencher
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Kieran Buckeridge
Cecil Beaton
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Johnny Otto
Member of Parliament (uncredited)
- Nick Howden-Steenstra Sentry (uncredited)