Damian Lewis as Peter Radley / Will Radley

Kelly Macdonald as Helen Radley

Bo Bragason as Clara Radley

Harry Baxendale as Rowan Radley

Sophia Di Martino as Lorna Felt

Steven Waddington as Mark Felt

Madeleine Power as Tilly

Shaun Parkes as Jared Copeleigh

Jay Lycurgo as Evan Copeleigh

Freddie Wise as Stuart Harper

Suan-Li Ong as Croupier

Sarah Durham as Nicola

Lonnie Holley as Teenager (as Holly May Bradley)

Mark Weinman as Danny

Sophie Mercell as PC Henshall

Laura Waldren as PC Longford

Richa Prakash as Neighbour at Barbeque party

Lena Kaur as Karen

Gareth Barrington-Jones as The Neighbour

Svetlana Karabut as Nightclub DJ

Rebecca Riggs as Clubber

Dylan McKenzie as Teenager

Marica Cassandra as Woman 2

Daniel Riggs as Clubber

Jonah Williams as Teenager

Sandrine Anterrion as Night Club patron (uncredited)

Leon Cole as Teenager (uncredited)

Leon Cole as Club Dancer (uncredited)