Guest Stars Stephen Walters as Robbie Shaw Michael Maloney as Judge Christopher Lansing Sian Reese-Williams as Tina Harcourt Alexa Davies as Lucie Hudson Gabrielle Glaister as Donna Collyer Ben Caplan as Peter Harcourt Geoff Bell as Brian Collyer 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 Sid Sagar as Ben Malhotra