Guest Stars Fiona Dolman as Sarah Barnaby Annette Badland as Dr. Fleur Perkins Isabel Shaw as Betty Barnaby Ginny Holder as Lila Blundell Peter Serafinowicz as Lucian Shirewell Alex Macqueen as Francis Shirewell Sarah Woodward as Ursula Shirewell Agni Scott as Davina Shirewell Charles Dale as Gideon Blundell Patrick Pearson as Justin Inkerman Verity Marshall as Jordana Linsbury Jade Harrison as Sadie Rowcroft Joshua Griffin as Caleb Blundell Miya James as Sorrel Watkins