Jonathan Teplitzky Director Brian Cox Winston Churchill Actor Miranda Richardson Clementine Churchill Actor John Slattery Dwight Eisenhower Actor Ella Purnell Helen Actor Julian Wadham Bernard Montgomery Actor Richard Durden Jan Smuts Actor James Purefoy King George VI Actor Danny Webb Alan Brooke Actor Jonathan Aris Mallory Actor George Anton Admiral Ramsay Actor Steven Cree Captain Stagg Actor Angela Costello Kay Summersby Actor Peter Ormond Briggs Actor Alex von Tunzelmann Screenwriter Jo Bamford Executive Producer Ian Berg Executive Producer Hugo Grumbar Executive Producer Tim Haslam Executive Producer Phil Hunt Executive Producer Ian Hutchinson Executive Producer Michael Milillo Executive Producer Christopher Reynolds Executive Producer Compton Ross Executive Producer Lisa Clarkson Milillo Executive Producer Ronnell Shaw Executive Producer Claudia Bluemhuber Producer Nick Taussig Producer Piers Tempest Producer Paul Van Carter Producer Lorne Balfe Original Music David Higgs Cinematographer Chris Gill Film Editing Daniel Hubbard Casting Chris Roope Production Design Fiona Gavin Art Director Neesh Ruben Set Decoration Bartholomew Cariss Costume Design