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 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 Tim Dantay as Robbie Sally Rogers as Sheila Nasreen Hussain as Morecambe Doctor Hayley Cartwright as Young Barbara Georgina Davies as Young Jenny Juliet Davies as Young Sheila Suzanne Fulton as Morecambe Nurse Eliza Marsland as Rosemary Rachael McGuinness as Young Heather Connie Thorniley as Young Karen