Guest Stars James Clack as Young Martin Jake Curran as Padraig Pearse O'leary Izabella Urbanowicz as Rosie Demarczyk Françis Renaud as Paul Capoue Héléna Soubeyrand as Clothilde Maxime Lefrançois as Romain Sam Mackay as Denny Damien Taranto as Nico Sarah Niles as DCI Diane Squire Tolga Safer as Hakan Philip Arditti as Veysel Sophie Cosson as Abi Jay Saighal as Landlord