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How many wizards are there in the UK and Ireland?
Fans of Harry Potter have been asking - just how many wizards live among us? J K Rowling has been quoted as saying there were 3000 wizards in the UK and Ireland. Tim Harford and Lizzy McNeill follow a trail of clues in J K Rowling's best-selling books to provide the definitive estimate of the wizarding population.
First broadcast on More or Less, 3 June 2018.
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