Character Name : Winston Churchill

Original Name : Gary Oldman

Gender : Male

Character Name : Clemmie

Original Name : Kristin Scott Thomas

Gender : Female

Character Name : King George VI

Original Name : Ben Mendelsohn

Gender : Male

Character Name : Elizabeth Layton

Original Name : Lily James

Gender : Female

Character Name : Neville Chamberlain

Original Name : Ronald Pickup

Gender : Male

Character Name : Viscount Halifax

Original Name : Stephen Dillane

Gender : Male

Character Name : Sir John Simon

Original Name : Nicholas Jones

Gender : Male

Character Name : Sir Anthony Eden

Original Name : Samuel West

Gender : Male

Character Name : Clement Atlee

Original Name : David Schofield

Gender : Male

Character Name : General Ismay

Original Name : Richard Lumsden

Gender : Male

Character Name : General Ironside

Original Name : Malcolm Storry

Gender : Male

Character Name : Arthur Greenwood

Original Name : Hilton McRae

Gender : Male

Character Name : Sir Samuel Hoare

Original Name : Benjamin Whitrow

Gender : Male

Character Name : John Evans

Original Name : Joe Armstrong

Gender : Male

Character Name : Air Chief Marshal Dowding

Original Name : Adrian Rawlins

Gender : Male

Character Name : Admiral Ramsay

Original Name : David Bamber

Gender : Male

Character Name : Admiral Dudley Pound

Original Name : Paul Leonard

Gender : Male

Character Name : President Roosevelt (voice)

Original Name : David Strathairn

Gender : Male

Character Name : Tom Leonard

Original Name : Eric MacLennan

Gender : Male

Character Name : Sawyers

Original Name : Philip Martin Brown

Gender : Male

Character Name : Cabinet Secretary Bridges

Original Name : Demetri Goritsas

Gender : Male

Character Name : Randolph Churchill

Original Name : Jordan Waller

Gender : Male

Character Name : Diana Churchill

Original Name : Alex Clatworthy

Gender : Female

Character Name : Mary Churchill

Original Name : Mary Antony

Gender : Female

Character Name : Sarah Churchill

Original Name : Bethany Muir

Gender : Female

Character Name : Pamela Churchill

Original Name : Anna Burnett

Gender : Female

Character Name : Lord Stanhope

Original Name : Jeremy Child

Gender : Male

Character Name : Lord Kingsley Wood

Original Name : Brian Pettifer

Gender : Male

Character Name : Lord Londonderry

Original Name : Michael Gould

Gender : Male

Character Name : House of Commons Speaker

Original Name : Paul Ridley

Gender : Male

Character Name : Ernle Hastings

Original Name : Robin Pearce

Gender : Male

Character Name : Equerry

Original Name : Michael Bott

Gender : Male

Character Name : Reynaud

Original Name : Olivier Broche

Gender : Male

Character Name : Daladier

Original Name : Mario Hacquard

Gender : Male

Character Name : BBC Producer

Original Name : Pip Torrens

Gender : Male

Character Name : Actor

Original Name : Edmund Wiseman

Gender : Male

Character Name : Abigail Walker

Original Name : Hannah Steele

Gender : Female

Character Name : Alice Simpson

Original Name : Nia Gwynne

Gender : Female

Character Name : Marcus Peters

Original Name : Ade Dee Haastrup

Gender : Male

Character Name : Maurice Baker

Original Name : James Eeles

Gender : Male

Character Name : Jessie Sutton

Original Name : Flora Nicholson

Gender : Male

Character Name : Young Girl on Tube

Original Name : Bronte Carmichael

Gender : Female

Character Name : Agnes Dillon

Original Name : Roisin O'Neill

Gender : Female

Character Name : Oliver Wilson

Original Name : John Locke

Gender : Male

Character Name : Margaret Jerome

Original Name : Joanna Neary

Gender : Female

Character Name : Brigadier Nicholson

Original Name : Richard Glover

Gender : Male

Character Name : Ramsay Staffer

Original Name : Tom Ashley

Gender : Male

Character Name : Reporter

Original Name : Joshua Higgott

Gender : Male

Character Name : Teenage Girl at Tube Map

Original Name : Imogen King

Gender : Female

Character Name : Naval Map-Room Officer

Original Name : Miles Gallant

Gender : Male

Character Name : Sybil

Original Name : Faye Marsay

Gender : Female

Character Name : Sir Alexander Cadogan

Original Name : John Atterbury

Gender : Male

Character Name : AD Nicholl (Secretary #1)

Original Name : James Harkness

Gender : Male

Character Name : W D Wilkinson (Secretary #2)

Original Name : Joshua James

Gender : Male

Character Name : Christopher Wilson (Photographer)

Original Name : Charley Palmer Rothwell

Gender : Male

Character Name : Maid

Original Name : Patsy Ferran

Gender : Female

Character Name : Cook

Original Name : Sarah Flind

Gender : Female

Character Name : Back Bencher

Original Name : Steffan Donnelly

Gender : Male

Character Name : Cecil Beaton

Original Name : Kieran Buckeridge

Gender : Male

Character Name : Member of Parliament (uncredited)

Original Name : Johnny Otto

Gender : Male

Character Name : Sentry (uncredited)

Original Name : Nick Howden-Steenstra

Gender : Male