Guest Stars Anthony Calf as Deputy Assistant Commissioner Robert Strickland Amy Nuttall as Caitlin Standing Storme Toolis as Holly Griffin David Newman as Robin Candida Benson as Ruth Taskerland Jack Shepherd as William Taskerland Alun Raglan as Ethan Clare Cathcart as Harriet Danielle Carrington as Amy Taskerland Federay Holmes as Carla O'Brien Lawrence Stubbings as Younger William Martin Turner as Hines Rosie Wyatt as Young Harriet Tom Ashley as Dominic
