Albert Finney as Winston Churchill

Vanessa Redgrave as Clemmie Churchill

Jim Broadbent as Desmond Morton

Linus Roache as Ralph Wigram

Lena Headey as Ava Wigram

Tom Wilkinson as Sir Robert Vansittart

Derek Jacobi as Stanley Baldwin

Celia Imrie as Violet Pearman

Hugh Bonneville as Ivo Pettifer

Tom Hiddleston as Randolph Churchill

Ronnie Barker as David Inches

Gottfried John as Friedrich von Schroder

Anthony Brophy as Brendan Bracken

Edward Hardwicke as Mr. Wood

Tim Bentinck as Marlborough

Dolly Wells as Sarah Churchill

Lyndsey Marshal as Peggy

Walter Sittler as German Diplomat

John Standing as Lord Moyne

Simon Williams as Terence Philip

Joanna McCallum as Marjorie