Jessie Buckley Marian Halcombe Actor Olivia Vinall Laura Fairlie, Anne Catherick Actor Art Malik Erasmus Nash Actor Vicki Pepperdine Mrs Michaelson Actor Nicholas Jones Mr Gilmore Actor Ruth Sheen Mrs Clements Actor Sonya Cassidy Madam Fosco Actor Dougray Scott Sir Percival Glyde Actor Riccardo Scamarcio Count Fosco Actor Clare Mcmahon Fanny Actor Tony Flynn Mr Merriman Actor Gary Gillespie Blackwater Servant Actor Michael Hooley Coachman Actor Carla Bryson Margaret Actor Rea Johnston Laura, Anne Double Actor Fiona Seres Writer David M. Thompson Executive Producer Sarah Curtis Producer Carl Tibbetts Director Joanie Blaikie Executive Producer Mona Qureshi Executive Producer