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 Yemisi Oyinloye as Amber Jay Rincon as Patrick Gerald Kyd as Roger Muir Sacha Parkinson as Laura Louise Jocelyn Gemma Jones as Heather Childs Alan French as 80s Weekend Official Christine Walsh as Lakes Nurse Kiran Dadlani as Priti