Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Stephanie Leonidas as Annabel Latimer Amanda Burton as Carole Latimer Deborah Findlay as Lorna Soane Joe Absolom as Luke Altman Andrew Lee Potts as Gideon Latimer Noma Dumezweni as Ailsa Probert Justin Salinger as Curate Andrew Maplin Fraser Ayres as Theo Bainbridge Jack Shepherd as Magnus Soane Alan McKenna as Rhodri Probert Merelina Kendall as Dr. Dorthea Grenville