Guest Stars Natasha Raphael as Irene Edwards Beth Bradfield as Jean Dunlop Imogen Lamb as Mary-Lou Linnett Jennifer Wigmore as Miss Grayling Jude Harper-Wrobel as Ron Gilson Twinkle Jaiswal as Katherine Saskia Kemkers as Emily Lake Imali Perera as Miss Potts Hannah Saxby as Pamela Christine Horne as Margaret Lake Jaimie Kollmer as Penelope Catherine Bailey as Miss Gale Palmer Newson as Joan Lacey