Guest Stars Daisy Edgar-Jones as Olivia Marsden Ceallach Spellman as Matthew Williams Sylvie Briggs as Ellie Marsden Madeleine Edmondson as Chloe Gifford Jack Harper as Adam Gifford Lucy Robinson as Robyn Duff Sunetra Sarker as Deborah Claire Keelan as Sandra Gerald Kyd as Roger Muir Yemisi Oyinloye as Amber Jay Rincon as Patrick Tim Dantay as Robbie Sally Rogers as Sheila Jamel Dwyer as Toby Alan Williams as Chris Rebecca Ashton as Waitress