Guest Stars Noma Dumezweni as Captain Erisa Magambo Lee Evans as Malcolm Daniel Kaluuya as Barclay Adam James as DI McMillan Ellen Thomas as Carmen David Ames as Nathan Paul Kasey as Sorvin Victoria Alcock as Angela Ruari Mears as Praygat Glenn Doherty as Sgt. Dennison Reginald Tsiboe as Lou Keith Parry as Bus Driver James Layton as Sgt. Ian Jenner