It's a conundrum every schoolchild has wrestled with - which witch is which?

But this time it's not spelling that's in question - it's the bewitching magic of Harry Potter.

Harry Potter And The Philosopher's Stone is currently breaking cinema box office records.

But are the boy wizard's adventures based on fact, or are they just a broomstick flight of fantasy?

Children from Western Road Primary School, Lewes, will be able to answer some of those questions after getting a sneak preview of a documentary called Discovering The Real World Of Harry Potter.

The television film, to be aired on Sunday, looks at the myths, legends, alchemy and magic in JK Rowling's books.

It introduces real people that inspired the tale and visits locations renowned for witches, ghosts, wizards and potions.

The documentary is made by Atlantic Productions. Its Seaford-based spokesman, Jonathan Vernon, said: "Our film brings a real-life focus to the Potter phenomenon.

"It also gives teachers the opportunity to go beyond the Harry Potter books and start looking at Greek mythology and legends.

"We're showing it to the children to get their views so we can tailor it to their needs.

"We want to bring out a DVD in January which will be suitable for classroom use."

The film visits Gordonstoun, the Prince of Wales's old boarding school in Scotland, which was a possible model for Hogwarts.

It journeys underneath platform nine-and-a-half at Kings Cross Station to unearth the burial place of an ancient Briton and it introduces Jean Dubuis, an 82-year-old disciple of the alchemist Nicolas Flamel, who lives in the oldest house in Paris. He tells of his search to find the real Philiosopher's Stone.

The documentary can be seen on the Discovery Channel at 7pm tomorrow. Videos are also available from Tesco.