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