Guest Stars Fiona Dolman as Sarah Barnaby Georgie Glen as Mary Oswood Claire Skinner as Kitty Oswood Jodie Tyack as Polly Oswood Samuel West as James Oswood Anamaria Marinca as Petra Antonescu Abigail Cruttenden as Nell Fryer John Macmillan as Solomon Franks Nicholas Gleaves as Ray Fryer Chris Lew Kum Hoi as Ronin Chow Susie Blake as Gemma Christie Karl Theobald as Doug Vaughan Paul Shelley as Walter Oswood Lotte Spring Rice as Samantha Berry Thalissa Teixeira as Jane Everard