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