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 Sacha Parkinson as Laura Louise Jocelyn Gemma Jones as Heather Childs Ivanno Jeremiah as Charlie Sinclair Marie Critchley as Lorraine Menyee Lai as Jury Bailiff Martin Oldfield as Judge Alexis Platt as Kevin