Guest Stars Daniel Ezra as Dan Johnson Vincent Regan as Dominic Carter Derek Riddell as Paul Brightman Tamara Lawrance as Clem Johnson Shannon Hayes as Ella Johnson Angel Coulby as Julia Redhead Alistair Petrie as Robert Greenlaw Mark Bonnar as John Halliday Leanne Best as Abigail Strickland Ṣọpẹ́ Dìrísù as Michael Antwi Sam Stockman as PC Rose Cecilia Noble as Mrs. Antwi David Schofield as Alex Brady Ian Peck as Peter Mackie Glyn Grimstead as Sgt. Douglas Trimble Nathan Nolan as Dr. Mark Ambrose Carmela Corbett as Lola