Neil Dudgeon character Joshua
Asa Butterfield character Brethren Boy
Bill Milner character Will Proudfoot
Jessica Hynes character Mary Proudfoot
Anna Wing character Grandma
Will Poulter character Lee Carter
Tallulah Evans character Jess Proudfoot
Emilie Chesnais character French Teacher
Paul Ritter character Geography Teacher
Jules Sitruk character Didier Revol
Adam Buxton character Science Teacher
Ed Westwick character Lawrence Carter
Adam Paul Harvey character Lawrence's Henchman
Atila Emirali character Rambo Double
Sylvester Stallone character John Rambo (archive footage) (uncredited)
