James McAvoy as Bruce

Jamie Bell as Lennox

Eddie Marsan as Bladesey

Imogen Poots as Drummond

Brian McCardie as Gillman

Emun Elliott as Inglis

Gary Lewis as Gus

John Sessions as Toal

Shauna Macdonald as Carole

Jim Broadbent as Dr Rossi

Joanne Froggatt as Mary

Kate Dickie as Chrissie

Martin Compston as Gorman

Iain De Caestecker as Ocky

Shirley Henderson as Bunty

Joy McAvoy as Estelle

Jordan Young as Lexo

Pollyanna McIntosh as Size Queen

Bobby Rainsbury as Stephanie

Michael Moreland as Tramp

Therese Bradley as Madam Maisie

Zack Eisaku Niizato as Japanese Student

Robin Laing as Rent Boy

Franziska Altmeyer as Hamburg Carole

Ron Donachie as Hector

Tracy-Ann Oberman as Diana

Mitchell Mullen as Bobby

Jake Wilson as Little Davie

Luke MacDonald as Euan

Jodie Mccallum as Dealer's Girlfriend

Chris Young as Drunken Santa Claus

Jonathan Watson as Uniformed Policeman

David Soul as Punter

Chris Cameron as Skanky Dealer

Colin Healy as Colin

Lauren Maddox as Posh Lady

Natasha O'Keeffe as Anna

Chidi Chickwe as Steven

Sanjeev Kohli as Sunil

Neil D'Souza as Anil

Vanda Dadras as Air Stewardess

Jamie Wallace as Obnoxious Son

Trudie Styler as Madame R Zen Ficken

Megan Finn as Stacey

Craig Garner as Dwarf (uncredited)

Emma Bryant as Jessie (uncredited)