Simon Pegg

Character: Dennis

Thandiwe Newton

Character: Libby

Hank Azaria

Character: Whit

Dylan Moran

Character: Gordon

Harish Patel

Character: Mr. Goshdashtidar

India de Beaufort

Character: Maya Goshdashtidar

Matthew Fenton

Character: Jake

Simon Day

Character: Vincent

Ruth Sheen

Character: Claudine

Nevan Finegan

Character: Mickey

Tyrone Huggins

Character: Grover

Iddo Goldberg

Character: News Reporter

Ameet Chana

Character: Taxi Driver

Chris Hollins

Character: Himself

Denis Lewis

Character: Herself

Sutara Gayle

Character: Nurse

Gabriel Fleary

Character: Drag Queen

Pandora Colin

Character: Claire

Stephen Merchant

Character: Man with Broken Leg

David Walliams

Character: Man in Bakery

Hazel Douglas

Character: Older Woman

Anna Tolputt

Character: Receptionist

Simon Lenagan

Character: Undercover Cop / Dad

David Cann

Character: Marathon Official

T.R. Bowen

Character: Doctor

Margaret John

Character: Libby's Grandmother

Floella Benjamin

Character: Libby's Mum

David Milner

Character: Libby's Dad

Henrietta Clemett

Character: Reception Nurse

Peter Serafinowicz

Character: TV Commentator

Preston Nyman

Character: Boating Boy (uncredited)

Rene Costa

Character: Spectator (uncredited)