When JK Rowling sold the film rights to her hit Harry Potter books, she was determined not to allow Hollywood to Americanise her Wizarding World.

Stars from across the pond, like Robin Williams, lobbied hard for roles like Hagrid and Lupin, but the author was determined to keep Hogwarts purely British.

Her personal choices included Robbie Coltrane, Maggie Smith and Alan Rickman, but one British actor didn’t get on well with the franchise.

Zoë Wanamaker was cast as Quidditch instructor Madam…