Jim Broadbent as Santa Claus

Rafe Spall as Steve

Warwick Davis as Sally

Jodie Whittaker as Alison

Stephen Graham as Barber

Joanna Scanlan as Ruth

Kit Connor as Tom

Joshua McGuire as Tony

Ewen Bremner as PC Finkerton

Hera Hilmar as WPC Boyle

Nonso Anozie as Knuckles

Perry Benson as Jimbo

Matt King as Brian

Bjarne Henriksen as Lars

Mick Walter as Entwhistle

Brian Bovell as Policeman

Simon Kunz as Ugly Sister

Graham Hughes as Buster Evergreen

Leigh Gill as Specs

Mark Del Amo as Hoarse Prisoner

Neil Ashton as Another Prisoner

Susanna Reid as Breakfast TV Presenter/Herself

Jon Snow as Channel 4 Newsreader/Himself

Daniel Barker as Radio News Reporter

Craig Garner as Elf (uncredited)

Nicholas Camm as Guard

Bernadette Windsor as Dolores