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