Thaddeus O'Sullivan Director Brendan Gleeson Winston Churchill Actor Clive Mantle Thompson Actor Adrian Scarborough Sawyers Actor Jack Shepherd Neville Chamberlain Actor Donald Sumpter Lord Halifax Actor Andrew Havill King's Private Secretary Actor Iain Glen King George VI Actor James D'Arcy Jock Colville Actor Bill Paterson Clement Attlee Actor Bruce Alexander Duff Cooper Actor Janet McTeer Clementine Churchill Actor Kathryn Sumner Mary Churchill Actor Michael Elwyn Charles Moran Actor Robert Pugh General Ismay Actor Terrence Hardiman Captain Pim Actor Michael Hadley Admiral Peace Actor Emma Hamilton Betty Actor Garrick Hagon Harry Hopkins Actor Len Cariou President Franklin D Roosevelt Actor Gethin Anthony 1st Pilot Actor Ben Righton 2nd Pilot Actor Alister Cameron Vice Marshall Park Actor Patrick Malahide Major General Bernard Montgomery Actor Hugh Whitemore Writer Frank Doelger Producer Julie Payne Producer Tracey Scoffield Producer Ann Wingate Producer Ridley Scott Executive Producer Tony Scott Executive Producer David M. Thompson Executive Producer David W. Zucker Executive Producer Howard Goodall Music Michel Amathieu Cinematographer John Bloom Film Editor Antonia Van Drimmelen Film Editor Paul Ghirardani Art Director Luciana Arrighi Production Design Ian Whittaker Set Decoration Consolata Boyle Costume Design Kate Rhodes James Casting