Guest Stars Barry Sloane as DS Jim Dawson Mark Ivanir as Alexander Goldfarb Daniel Ryan as DAC Peter Clarke Temirlan Blaev as Young Anatoly Litvinenko Kayla Meikle as DC Deborah Maxwell Richard Pepper as DCI Duncan Ball Kirsten Foster as Jenny Hyatt Sam Troughton as DI Brian Tarpey Estella Daniels as Dr Onome George Marcus Onilude as Aidan Aleksandar Mikic as Dmitry Kovtun Rad Kaim as Andrey Lugovoy Nikolai Tsankov as Boris Berezovsky Edward Baker-Duly as Martin Svennson Zoe Telford as Ingrid Campbell Sam Marks as DC Oliver Gadney Joanna Kanska as Nika Privalova Simon Haines as Dr. Benjamin Swift Daniel Paton as Russian Driver Mitya Savelau as Hotel Concierge