Gemma Arterton Kate Henderson Actor Rafe Spall Stuart Henderson Actor Khalid Abdalla Zak Hussein Actor Alex Kingston Rose Trewen Actor Roger Allam Sir Alan Brabazon Actor Mark Stanley Ryan Walker Actor Amaka Okafor Imogen Conrad Actor Avinash Ravindra Sangvhi Actor Aoife Hinds Julie Price Actor Rochenda Sandall Melissa Morris Actor Alma Prelec Lena Savic Actor Galaxie Clear Fiona Henderson Actor Gail Egan Producer, Executive Producer Tom Bradby Writer, Executive Producer Jemma Kenedy Writer Andrea Calderwood Executive Producer Chloe Sizer Executive Producer