Guest Stars Ceallach Spellman as Matthew Williams Daisy Edgar-Jones as Olivia Marsden Sylvie Briggs as Ellie Marsden Madeleine Edmondson as Chloe Gifford Jack Harper as Adam Gifford Lucy Robinson as Robyn Duff Claire Keelan as Sandra Sunetra Sarker as Deborah 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