MI-5 Season 5 Episode 9 The Criminal

The team must protect Niko Grecic, a witness in the trial of Serbian war criminal General Tezlia. Grecic was Tezlia's right-hand man, but has earned immunity by testifying against him. However, Tezlia still has many loyal comrades who want Grecic dead, including Richard Dempsey, an MI6 traitor who defected years ago to join Tezlia in his genocide against Bosnian Muslims.