Guest Stars Mark Bonnar as Piers Christie Adam James as Dr. Richard Fell Amanda Drew as DI Reid Davood Ghadami as Ali Kolahi Lashana Lynch as Shona Benson Bryan Dick as Lucas Ballinger Freya Parker as Mary Smith Bill Ward as Hearns Ashley Chin as Mark Benson Bryony Afferson as Petra Smith Wendy Albiston as Stacey Greggs Alexander Newland as Flynn Deshaun Strong as Darius Benson Sammy Kissin as Ellisabet Vrinska Sean Jackson as Roper Matthew Owens as Firefighter
