We're singing Happy Birthday to JK Rowling, who turns 43 today. Help us celebrate by taking our quiz to find out how well you know her Harry Potter books. There's one question for each book, but those of you who haven't finished the whole series be warned — this contains spoilers! Once you've taken the quiz enter our Harry Potter themed giveaway — one lucky UK-based TeamSugar member will win a Harry Potter Years 1-5 Box Set DVD plus a Philips Widescreen LCD TV and DVD player!!

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