Harry Potter influences and analogues
Many critics have noted that Jill Murphy's "The Worst Witch" series (first published in 1974 by Allison & Busby), is set in a school for girls, "Miss Cackle's Academy for Witches", reminiscent of Hogwarts. The story concerns an awkward pupil at a boarding-school for witches, who faces a scheming rival student. Her professors include a kindly and elderly headmistress and a bullying, raven-haired potions teacher. Murphy has commented on her frustration at constant comparisons between her work and "Harry Potter": "It's irritating … everyone asks the same question and I even get children writing to ask me whether I mind about the Hogwarts school of witchcraft and pointing out similarities. Even worse are reviewers who come across my books, or see the TV series, and, without taking the trouble to find out that it's now over quarter of a century since I wrote my first book, make pointed remarks about 'clever timing' – or say things like 'the Worst Witch stories are not a million miles from J K Rowling's books'. The implications are really quite insulting!"
The Worst Witch
Miss Cackle has an evil twin sister named Agatha Cackle, who is bitterly jealous of her position of authority at the Academy. In the first of the series, Agatha and her coven of rebellious witches plotted to overthrow Miss Cackle and turn her, the staff, and students into frogs as they slept. Mildred caught them as they brewed their invisibility potion, by turning them into snails and taking them to the school to show Miss Cackle. Ashamed that her own sister would break the Witches' Code, she ordered Agatha to accept defeat and live the code like all decent witches. Agatha reluctantly co-operated. She tries to take over again at the end of series 1, by pretending to be Miss Cackle and dragging Mildred out of the classroom by her ear.