Guest Stars Fiona Dolman as Sarah Barnaby Annette Badland as Dr. Fleur Perkins Isabel Shaw as Betty Barnaby Sabina Franklyn as Elaine Bennet Gary Beadle as Damian Bennet Peter Polycarpou as Giles Franklyn Mariam Haque as Jenny Bennet Geff Francis as Billy Bevan Alex Walkinshaw as Sam Engells Lorne MacFadyen as Lionel Bennet Tom Conti as Sebastian Cabot Jules Robertson as Charlie Cabot Elizabeth Payne as Ruth Cabot Diana Yekinni as Matty Bennet