Uncredited Heather Cave as Maisie Simm Ralph Ineson as Sam Walker Ray Panthaki as Chalak Ahmed Christopher Fulford as Johnny Marks Kevork Malikyan as Ozan Cosar Katie Jones as Leyla Ahmed Jeremy Bulloch as Roger Welks Steve Garti as Stan Fisun Burgess as Selin Cozar Oliver Haden as Sonay Alkan Beth Vyse as Tara Welks Karzan Krekar as Serka