Guest Stars Daisy Edgar-Jones as Olivia Marsden Sylvie Briggs as Ellie Marsden Ceallach Spellman as Matthew Williams Jack Harper as Adam Gifford Madeleine Edmondson as Chloe Gifford Lucy Robinson as Robyn Duff Marji Campi as Barbara Blyth Sunetra Sarker as Deborah Claire Keelan as Sandra Gerald Kyd as Roger Muir Gemma Jones as Heather Childs Sacha Parkinson as Laura Louise Jocelyn Ivanno Jeremiah as Charlie Sinclair Martin Oldfield as Judge Menyee Lai as Jury Bailiff Alexis Platt as Kevin Marie Critchley as Lorraine