To celebrate the 15th anniversary of the publication of Harry Potter and the Philosopher's Stone Bloomsbury is launching a competition to find the biggest Harry Potter fan in Australia and New Zealand.

Bloomsbury is inviting fans to write a letter of no more than 50 words explaining why they love Harry Potter. We are looking for the most creative, clever and entertaining reasons and, while the word limit is set to a strict 50 words, entrants are encouraged to draw, doodle and make their letters as elaborate as possible.

Harry Potter fans can only enter by visiting a local bookshop and posting their letter in the specially designed postboxes. Over 400 bookshops have already signed up to take part. The competition will run from Tuesday 26th June to Tuesday 31st July 2012 after which we will name the biggest HHarry Potter fan in Australia and New Zealand. The winner and runners up will be announced on Saturday 1st September.