Guest Stars Jennifer Wigmore as Miss Grayling Beth Bradfield as Jean Dunlop Natasha Raphael as Irene Edwards Imogen Lamb as Mary-Lou Linnett Ashley McGuire as Matron Genevieve Beaudet as Mam'zelle Rougier Twinkle Jaiswal as Katherine Saskia Kemkers as Emily Lake Imali Perera as Miss Potts
