Guest Stars Derek Riddell as Pete Shawe Kate Ashfield as Yvonne Fulcher Owain Arthur as DI Sean Memory Jessica D'Arcy as Lora O'Callaghan Peter Wight as Charlie Edwards Jake Davies as Liam O'Callaghan Joe Absolom as Christopher Halliwell Ian Puleston-Davies as Mick O'Callaghan Faye McKeever as Deborah Peach Charlie Cooper as Kevin Reape Dominic Tighe as DS Bob Cooper Rufus Gerhardt-Williams as Aiden O'Callaghan Anna Wilson-Jones as Jackie Maimie McCoy as DC Tracy Joyce Stephanie Hyam as Becky Godden-Edwards Simone Lahbib as Debbie Emma Clifford as Annette Darcy Vanhinsbergh as Steven Edwards Orla Hill as Jennifer Fulcher Gary Oliver as DCC Pat Geenty Florence Howard as Sian O'Callaghan Caroline Bartleet as DS Sarah Bilston David Biscoe as Bevan David Nellist as DI Steve Kirby Lisa Faulkner as Ray Hayward's Partner Morwenna Banks as Tracey Mullane David Keeling as CC Brian Moore Christopher Coghill as Alan Tobi Bamtefa as Jeremy Sirleaf Naomi Yang as Penny Jonny Lavelle as PS Marcus Beresford-Smith Becky Brunning as Ellie Mack Esh Alladi as Chris Akula Kirris Riviere as Delivery Man Jane Perry as Headmistress