Gina McKee
Marion

Linus Roache
Tom

Rupert Everett
Patrick

Harry Styles
Younger Tom

Emma Corrin
Younger Marion

David Dawson
Younger Patrick

Kadiff Kirwan
Nigel

Emily John
Pamela

Dora Davis
Sylvie

Joseph Potter
Roy

Richard Dempsey
Librarian

Freya Mavor
Julia

Maddie Rice
Jackie Stewart

Richard Cant
Rudy

Lucy Briers
Miss Brown

Jack Bandeira
Leonard

Gareth Kennerley
Policeman in Alleyway

John Sandeman
Policeman in Alleyway

Nicholas Tennant
Gordon Burgess

Charlotte Randle
Mrs. Burgess

Patrick Brennan
Detective Inspector

Brian Martin
Police Constable

James Tucker
Duty Police Officer

Tristan Sturrock
Defense Counsel

Ian Drysdale
Prosecutor

Stefano Braschi
Jonathan

Simon Shorten
Prison Cellmate

Michael Ayala-Cole
Teddy Boy (uncredited)

James Hare
Pier Visitor (uncredited)

Sarah Lockett
Teacher (uncredited)

Róisín Monaghan
Teacher (uncredited)

Andrew Tiernan
Bert (uncredited)