Joe Sims plays Adrian Peck, a hot-tempered and suspicious character similar to his best known role as Nige Carter in Broadchurch (2013) which filmed its third and final series in spring 2016, the same as this episode.
Frances Barber plays Ingrid Lockston in this episode. She previously played the role of Constance Fielding in episode 13.5, Master Class (2010).
Marty Cruikshank plays Cecily Hope in this episode. She previously played the role of Madeline Villiers in episode 8.3, Orchis Fatalis (2005).
Philip Bird plays Duncan Walton in this episode. He previously played the role of Jeff Martin in episode 8.6, Hidden Depths (2005).