Guest Stars Andrew Scott as Chris Gilheany Daniel Ings as David Gilkes Topher Grace as Billy Bauer Amanda Drew as Hayley Blackwood Damson Idris as Jaden Tommins Quincy Dunn-Baker as Don Monica Dolan as CS Linda Grace Sarah Ridgeway as WPC Roach Adam McNamara as Marksman Harris Jorge Cordova as Agent Ernesto Cruz Mirirai Sithole as Shonelle Laura Morgan as Thalia Archie Rush as Cosmo Doyle Caitlin Innes Edwards as Hannah Kent Ruibo Qian as Penelope Wu Calum Callaghan as PC Damien Bullen Roger Alborough as Joe Seun Shote as Simon Alice Bailey Johnson as Markswoman Jones Crystal Clarke as Tipi Ambreen Razia as WPC Najma Haque Maggie Bain as Maryam Conrad Khan as Dibbs Gareth Kane as PC Wanson Hilary Connell as Receptionist