Guest Stars Neil Stuke as Dr. Haydock Joanna Lumley as Dolly Bantry Hannah Waddingham as Lola Brewster Hugh Bonneville as Insp. Hewitt Charlotte Riley as Margot Bence Brennan Brown as Hailey Preston Victoria Smurfit as Ella Blunt Lindsay Duncan as Marina Gregg Caroline Quentin as Heather Badcock Jonathan Coyne as French Officer Michele Dotrice as Mrs. Hubbard Samuel Barnett as Sgt. Tiddler Will Young as Casey Croft Nigel Harman as Jason Rudd Martin Jarvis as Vincent Hogg Olivia Darnley as Cherry Baker Anna Andresen as Maisie Cooper Don Gallagher as Man in Livery Gene Goodman as Louis Charles Isabella Parriss as Marie Thérèse Lois Jones as Primrose Dixon