Jonathan Cake as Oswald 'Tom' Mosley

Jemma Redgrave as Cimmie Curzon

Hugh Bonneville as Bob Boothby

Flora Montgomery as Baba

Ralph Riach as Ramsey MacDonald

Windsor Davies as David Lloyd George

Gresby Nash as Fruity Metcalfe

Emma Davies as Diana Mitford Guinness

Roger May as Jonathan Strachey

Paul Ireland as Allan Young

Orlando Wells as Cecil Beaton

Ken Jones as JH Thomas

Eric Allan as Philip Snowden

Berwick Kaler as Arthur Henderson

Arturo Venegas as Count Grandi

Debora Weston as Maxine Elliott

Philip Dunbar as Philip Sassoon

Robert Langdon Lloyd as Lord Curzon

Devon Scott as Lady Grace Curzon

Hugh Simon as Winston Churchill

Richenda Carey as Lady Mosley

Dermot Martin as Sgt O'Sullivan

Caroline Langrishe as Jane Bewley

Jeremy Child as Major Bewley

Roger Brierley as Neville Chamberlain

Edward Highmore as Derek Johnson

Jonathan Coy as Harold Nicholson

Ben Pullen as Peter Howard

Sonya Walger as Barbara Hutchinson

David Henry as William Morris

Stephen Gressieux as Benito Mussolini

Nigel Davenport as Lord Rothermere

Colum Convey as William Joyce

Mike Burnside as Neil Francis Hawkins

Brigitte Kahn as Margherita Sarfatti

Anouschka Menzies as Unity Mitford

Stephan Grothgar as Putzi Hansfstaengl

John Straiton as James Maxton

Reinhard Michaels as Adolf Hitler

Erich Redman as Joseph Goebbels

William Boscaven as Nicholas Mosley

Karl Draper as Makin

Alan Ford as Gaolor