E L James's Fifty Shades trilogy has outsold J K Rowling's Harry Potter series on Amazon's UK site. James has sold more than four million copies of her books in print and on Kindle since they went on sale in March, making her the bestselling author of all time at Amazon.co.uk.
JK Rowling's final book in the Potter series, Harry Potter And The Deathly Hallows, is being outsold by the first book in the James trilogy, Fifty Shades Of Grey, by more than two to one on the website.
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