Guest Stars Daisy Edgar-Jones as Olivia Marsden Ceallach Spellman as Matthew Williams Paul Ritter as Benjamin Stevens Sylvie Briggs as Ellie Marsden Madeleine Edmondson as Chloe Gifford Jack Harper as Adam Gifford Lucy Robinson as Robyn Duff Marji Campi as Barbara Blyth Jamel Dwyer as Toby Frances Barber as Maxine Ibson Liz Hume-Dawson as Rochelle Sanee Raval as Tim