The man nicknamed the real Prof Severus Snape has conjured up a spellbinding new leaflet outlining the real-life places behind the wizarding world of Harry Potter.

Ex-Wyedean teacher John Nettleship, who is thought to be the inspiration for Harry's arch-nemesis, has released the booklet to coincide with the latest movie Harry Potter and the Half-Blood Prince, which was released yesterday.

The former head of science, who taught author JK Rowling chemistry, has put places such as Clearwell Caves and Tutshill under the magical microscope in his pamphlet Harry Potter's Chepstow.

John says the winding tunnels of wizarding bank Gringott's are based on Clearwell Caves and the quirky layout of JK Rowling's childhood home of Church Cottage in Tutshill provided the inspiration for the Weasley family's home The Burrow.

The booklet is available from Chepstow Bookshop, priced £2.50. The new film is showing today at 4.30pm and 7.30pm at the Palace Cinema, Cinderford, and the Studio, Coleford.