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