JK Rowling has defended the publication of her new Harry Potter e-books after fans complained that they were filled with very little original writing by the best-selling author.

The Pottermore Presents series was released on Tuesday, consisting of three online-only books that packaged up writing from the free-to-access Harry Potter website Pottermore in themed editions.

The 10,000-word books included chapters on the workings of objects familiar to Harry Potter fans such as the Sorting Hat and the Marauder’s Map, as well as entries on all of the Ministers for Magic - the wizarding equivalent of the Prime Minister.

Although Rowling’s name was listed on the front of all three books, the copy inside has been compiled by staff from Pottermore. Anne Rafferty, the website’s director of product, creative and content, explained on Pottermore: “We read through everything in our archives, took pieces written by Rowling and the Pottermore editorial team, and sewed it all together.”