Gina McKee as Marion

Linus Roache as Tom

Rupert Everett as Patrick

Harry Styles as Younger Tom

Emma Corrin as Younger Marion

David Dawson as Younger Patrick

Kadiff Kirwan as Nigel

Emily John as Pamela

Dora Davis as Sylvie

Joseph Potter as Roy

Richard Dempsey as Librarian

Jae Alexander as Pianist London Café

Freya Mavor as Julia

Sean Jackson as Pedestrian

Maddie Rice as Jackie Stewart

Richard Cant as Rudy

Chris Ma as Pianist Argyle Bar

Lucy Briers as Miss Brown

Jack Bandeira as Leonard

Gareth Kennerley as Policeman in Alleyway

John Sandeman as Policeman in Alleyway

Nicholas Tennant as Gordon Burgess

Charlotte Randle as Mrs. Burgess

Patrick Brennan as Detective Inspector

Brian Martin as Police Constable

James Tucker as Duty Police Officer

Tristan Sturrock as Defense Counsel

Ian Drysdale as Prosecutor

Stefano Braschi as Jonathan

Harry Attwell as Prison Guard

Simon Shorten as Prison Cellmate

Michael Ayala-Cole as Teddy Boy (uncredited)

James Hare as Pier Visitor (uncredited)

Sarah Lockett as Teacher (uncredited)

Róisín Monaghan as Teacher (uncredited)

Andrew Tiernan as Bert (uncredited)