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