Colin Firth as Donald Crowhurst

Rachel Weisz as Clare Crowhurst

David Thewlis as Rodney Hallworth

Mark Gatiss as Ronald Hall

Genevieve Gaunt as 'Miss Teignmouth'

Jonathan Bailey as Ian Wheeler

Andrew Buchan as Ian Milburn

Simon McBurney as Sir Francis Chichester

Eleanor Stagg as Rachel Crowhurst

Ken Stott as Stanley Best

Finn Elliot as James Crowhurst

Kit Connor as Simon Crowhurst

Oliver Maltman as Dennis Herbstein

Sam Hoare as Mr. Hughes

Avye Leventis as Mrs. Hughes

Anna Madeley as Sara Milburn

Adrian Schiller as Mr. Elliot

Simon Chandler as Sidney Rawle

Alexia Traverse-Healy as Françoise Moitessier

Dorothy Atkinson as Eve Tetley

Sebastian Armesto as Nelson Messina

Martin Marquez as Franchessi

Mark Davison as Band Leader

Bruce Mackinnon as Barman

Richard Teverson as BBC Interviewer

Kerry Godliman as 'Bear and Swan' Landlady

Laurence Spellman as Benefits Officer

Greg Hicks as Captain Box

Richard Blaine as Chamber Member

Geoff Bladon as Mayor of Teignmouth

Maynard Crowe as Portishead Messenger

Paul Thornley as Portishead Operator

Stuart Davidson as Press Photographer

Robert Elphick as Reporter

Tim Downie as Style Editor

Ray Burnet as George

Zara Prassinot as Waterskiing Girl