Fans have long debated - just how many wizards live among us?

Aficionados of the Harry Potter book series have long debated - just how many wizards live among us? We follow a trail of clues in J K Rowling's best-selling books and extrapolate the figures to provide the definitive estimate of the wizarding population of the UK and Ireland.

(Photo: Universal Studios picture showing an artists impression of a planned theme park dedicated to Harry Potter. Credit: Universal Studios/PA Wire)