Brian Cox as Winston Churchill

Miranda Richardson as Clementine Churchill

John Slattery as Dwight Eisenhower

Julian Wadham as Bernard Montgomery

Richard Durden as Jan Smuts

Ella Purnell as Helen Garrett

James Purefoy as King George VI

Danny Webb as Alan Brooke

Jonathan Aris as Mallory

George Anton as Admiral Ramsay

Steven Cree as Captain Stagg

Peter Ormond as Briggs

Angela Costello as Kay Summersby

Kevin Findlay as Fanshawe

Miro Teplitzky as Adjutant Howard