“The mandrake forms an essential part of most antidotes, it is also, however, dangerous. Who can tell me why?” That was the question Professor Pomona Sprout posed to her Herbology class at Hogwarts.

Harry Potter fans can now visit the room where Harry, Ron and Hermione had their herbology lessons, and where they met mandrakes for the first time. Tom Felton, 34, has given Harry Potter fans a first ...