Guest Stars Joanna Bobin as Lady Cowper Jessica Madsen as Cressida Cowper Kathryn Drysdale as Genevieve Delacroix Geraldine Alexander as Mrs. Wilson Joanne Henry as Judgy Mama Ruby Barker as Marina Thompson Bert Seymour as Lord Fife Dominic Coleman as Lord Cowper Melissa Advani as Lady Eaton Jessie Baek as Miss Hallewell Gabrielle Oke as Miss Cordelia Patridge Bailey Patrick as Mr. Harris Chris Fulton as Sir Philip Crane Priya Kansara as Miss Eaton George Watkins as Lord Morrison Elle Meadows as Aubrey Hall Maid