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