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