Between 1997 and 2007, JK Rowling published her seven Harry Potter novels, which became the best-selling book series of all time.

The fantasy series about a wizard school boy has sold over 600 million copies worldwide and is available in 85 languages.

In fact, the last four books set records as the fastest-selling books in history with the final instalment, Harry Potter and the Deathly Hallows, selling around 2.7 million copies in the UK and 8.3 million in the US within the first 24 hours of…