Guest Stars Kingsley Ben-Adir as Dr. Marcus Summer Eva Birthistle as Kate Darrow Alistair Petrie as Stuart Bayliss Tilly Vosburgh as Dee Sinton Sean McKenzie as George Everitt Paul Copley as Malcolm Kenrich Co Starring Riley Jones as DC Mark Edwards Olivia Armstrong as Jessie Ashworth Joshua Hill as PC Mike Randall William Rush as Ryan Darrow Jacqueline Phillips as Jane Robinson Roland Oliver as Edwin Short Annabel Leventon as Margaret Kraszewski Pip Chamberlain as Neighbour Olivia Jack as Chloe Darrow Lynn Farleigh as Valerie Furlow Harriet Hunter-Purvis as Emily Bogdan Kominowski as Walter Kraszewski Evan Atherton as Boy