Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Patrick Robinson as Gregory Brantner Con O'Neill as Jim Caxton Maggie Steed as Sylvia Mountford Hattie Morahan as Hayley Brantner Martine McCutcheon as Debbie Moffett Kate Ashfield as Helen Caxton Eloise Webb as Poppy Ordish Sian Clifford as PC Milton Richard Dillane as Oliver Ordish Lucy Liemann as Beatrix Ordish Isabella Blake-Thomas as Holly Jesse Fox as Jake Yapley