Emilia Fox Dr Nikki Alexander Actor David Caves Jack Hodgson Actor Richard Lintern Dr Thomas Chamberlain Actor Liz Carr Clarissa Mullery Actor Kiza Deen DCI Naomi Silva Actor Vincent Carmichael Gym Owner Actor Belinda McGinley Karen Sawyers Actor Ross Hatt DS Walters Actor Jamie Michie Pete Sawyers Actor Helen Belbin Alice Sawyers Actor Lu Corfield Jane Ronald Actor Nitin Ganatra Simon Laing Actor Sara Huxley Adam Hayes' PA Actor Edward MacLiam Adam Hayes Actor Sally Scott Maria Hayes Actor Callum Burke Alex Hayes Actor Darren Raymond Jason Farrell Actor Julia Haworth Rosie Chamberlain Actor Matthew Arlidge Writer Kiaran Murray-Smith Producer Destiny Ekaragha Director Richard Stokes Executive Producer Hilary Salmon Executive Producer