Guest Stars Saskia Reeves as Alison McLennan Hattie Morahan as Ruth Brooks Juliet Stevenson as Diana Ellerby Zoe Telford as Freya Carlisle James Davies as Jarvis Patterson Shannon Tarbet as Samantha Coyle Antonia Campbell-Hughes as Chloe Brooks James Rochfort as Edward Florey Adam Garrett as Delivery Man Ian Bleasdale as Mr. Festing Orlando Seale as Dr. Beckham Hassani Shapi as Dr. Copeland Joanne Pearce as Marion Ferber Kathryn O'Reilly as Poppy Toynton Melanie Kilburn as Pauline Turrill Stephanie Street as Lakshmi Eyre Dylan Charles as Adrian Royal Uncredited Susannah Todd as Alumnae Guest Violet Macdonald as Young Freya