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