Guest Stars Harry Kirton as Finn Shelby Ian Peck as Curly Jordan Bolger as Isiah Annabelle Wallis as Grace Burgess Kate Phillips as Linda Shelby Billy Marwood as Charles Shelby Tony Pitts as Inspector Moss Wendy Nottingham as Mary Stephanie Hyam as Charlotte Murray Brendan Gibson as UVF Hardman / Undercover Officer Branwell Donaghey as UVF Hardman 1 George Gwyther as Karl Shelby Richard Brake as Anton Kaledin Richard Dillane as General Curran Anna Wilson-Hall as Wedding Lady 1 Sara Beasley as Wedding Lady 2 Timothy Harker as Officer 1 John Purcell as Officer 2