Guest Stars Nicholas Farrell as Chief Inspector Paxman Gabriel Howell as Elias Amy Manson as Charlotte Hillinghead Emily Barber as Kathleen Squires Nitin Ganatra as Ishmael Andrew Whipp as Ladbroke Chloe Raphael as Esther Jankovsky Philippa Dunne as Lorna Dunnet Anton Cross as Rick Williams Clare Perkins as Inspector Anderson Selva Rasalingam as Prime Minister Edwin Thomas as Alby Roderick Hill as Campsite Manager Richard Tate as Professor Hamish McCabe Louis Sparks as Duty Officer Tommy Garside as Eagan Zachary Hart as Lee Cozens Lydia Fraser as Grace Aron Dochard as Newspaper Vendor Jonathan Nyati as Vox Pop 1 Patricia England as Vox Pop 2 Joe Pitts as Vox Pop 3 Jessamine-Bliss Bell as Marina