Michael Gambon

Winston Churchill

Lindsay Duncan

Clemmie Churchill

Romola Garai

Millie Appleyard

Matthew Macfadyen

Randolph Churchill

Tara Fitzgerald

Diana Churchill

Rachael Stirling

Sarah Churchill

Bill Paterson

Lord Moran

Daisy Lewis

Mary Churchill

Alex Jennings

Anthony Eden

Chris Larkin

Rab Butler

James Wilby

Brendan Bracken

Patrick Kennedy

Jock Colville

Christian McKay

Christopher Soames

John Standing

Lord Camrose

Matilda Sturridge

Rosie Hopper

Matthew Marsh

Lord Beaverbrook

Ian Mercer

Sgt Murray

William Blenkinsop

Young Randolph

Eloise Webb

Young Diana

Dixie Egerickx

Young Sarah Churchill

Harper Gray

Young Nicholas Soames

Molly Ashby

Young Emma

Margot Orr

Marigold

Jon Wennington

Delegate (uncredited)