Guest Stars Daisy Edgar-Jones as Olivia Marsden Sylvie Briggs as Ellie Marsden Ceallach Spellman as Matthew Williams Madeleine Edmondson as Chloe Gifford Jack Harper as Adam Gifford Lucy Robinson as Robyn Duff Marji Campi as Barbara Blyth Claire Keelan as Sandra Sunetra Sarker as Deborah Gerald Kyd as Roger Muir Jay Rincon as Patrick Yemisi Oyinloye as Amber Sacha Parkinson as Laura Louise Jocelyn Gemma Jones as Heather Childs Christine Walsh as Lakes Nurse Kiran Dadlani as Priti Alan French as 80s Weekend Official