Guest Stars Stephen Walters as Robbie Shaw Michael Maloney as Judge Christopher Lansing Alexa Davies as Lucie Hudson Sian Reese-Williams as Tina Harcourt Gabrielle Glaister as Donna Collyer Geoff Bell as Brian Collyer Ben Caplan as Peter Harcourt Ellie Dadd as Cat Shaw Tahliya Lowles as Poppy Harcourt Sienna Sayer as Daisy Harcourt Zoe Harrison as Carol Alexander Isis Davis as Cheryl Wilkes Joy Richardson as Mrs. Lasher Liam Ainsworth as Owen Gillick Seraphina Beh as Jade Brandyce Garry Robson as DI Sid Clarke Janine Wood as Sharon Evelina Raymond Coulthard as D.S. Donald Hart