Domhnall Gleeson

Tim Lake

Rachel McAdams

Mary

Bill Nighy

Dad

Tom Hollander

Harry

Margot Robbie

Charlotte

Lydia Wilson

Kit Kat

Lindsay Duncan

Mum

Richard Cordery

Uncle D

Joshua McGuire

Rory

Will Merrick

Jay

Vanessa Kirby

Joanna

Tom Hughes

Jimmy Kincade

Clemmie Dugdale

Ginger Jenny

Harry Hadden-Paton

Rupert

Mitchell Mullen

Mary's Father, Fitz

Lisa Eichhorn

Mary's Mother, Jean

Jenny Rainsford

Polly

Natasha Powell

Aunty May

Philip Voss

Theatre Judge

Tom Godwin

Prompter

Catherine Steadman

Tina

Tom Stourton

John

Richard Griffiths

Lawyer in Play (uncredited)

Richard E. Grant

Lawyer in Play (uncredited)

Haruka Abe

Japanese Girl (uncredited)

Lee Nicholas Harris

Police Officer (uncredited)

Tom Coulston

Theatre Attendee (uncredited)

Jon Wennington

Paralegal (uncredited)

Cynthia Garbutt

Tube Passenger (uncredited)