Brendan Gleeson as Winston Churchill

Adrian Scarborough as Sawyers

Iain Glen as King George VI

James D'Arcy as Jock Colville

Janet McTeer as Clementine Churchill

Robert Pugh as General Ismay

Len Cariou as President Franklin D. Roosevelt

Patrick Malahide as Major General Bernard Montgomery

Aleksey Petrenko as Josef Stalin

Jack Shepherd as Neville Chamberlain

Donald Sumpter as Lord Halifax

Gethin Anthony as 1st Pilot

Emma Hamilton as Betty

John Albasiny as Stalin's Interpreter

Clive Mantle as Thompson

Andrew Havill as King's Private Secretary

Bill Paterson as Clement Attlee

Terrence Hardiman as Captain Pim