Guest Stars Fiona Dolman as Sarah Barnaby Annette Badland as Dr. Fleur Perkins Isabel Shaw as Betty Barnaby Clare Holman as Fiona Beauvoisin Rohan Nedd as Finn Wokoma Joanna Page as Holly Ackroyd Rosalie Craig as Carys Nicholson Roger Barclay as Alexander Beauvoisin Karl Collins as Samuel Wokoma Thomas Dominique as Wesley Peters Eleanor Bron as Maxine Dobson Katy Brand as Jemima Starling Ami Okumura Jones as Erin Turner