Colin Firth as Mark

Robert Carlyle as Robert

Anne-Marie Duff as Michelle

Nicholas Burns as Michael

Emilia Fox as Laura

David Oyelowo as Yemi

Julia Davis as Sally

Emily Woof as Sandra

Peter McNeil O'Connor as Hostel Manager

Charlie Creed-Miles as Man in Hostel

Megan Dodds as Anastasia

Toby Kebbell as Beggar 2

Gugu Mbatha-Raw as Girl at King's Cross Station

Nikki Amuka-Bird as Itshe

Nichola Burley as Zoe

Alan Mandel as Thug