Guest Stars Derek Riddell as Pete Shawe Owain Arthur as DI Sean Memory Kate Ashfield as Yvonne Fulcher Peter Wight as Charlie Edwards Jessica D'Arcy as Lora O'Callaghan Jake Davies as Liam O'Callaghan Joe Absolom as Christopher Halliwell Faye McKeever as Deborah Peach Dominic Tighe as DS Bob Cooper Ian Puleston-Davies as Mick O'Callaghan Charlie Cooper as Kevin Reape Rufus Gerhardt-Williams as Aiden O'Callaghan Maimie McCoy as DC Tracy Joyce Anna Wilson-Jones as Jackie Stephanie Hyam as Becky Godden-Edwards Simone Lahbib as Debbie Emma Clifford as Annette Darcy Vanhinsbergh as Steven Edwards Gary Oliver as DCC Pat Geenty Orla Hill as Jennifer Fulcher 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