J K Rowling among world's richest

Harry Potter author JK Rowling has joined the list of the world's richest people.

She is estimated to be worth £526m (€787m) and made her debut on Forbes' billionaires list at number 552.

Book sales, the money grossed from the two Harry Potter movies and toy sales has seen Rowling amass more than US$1bn.

The Duke of Westminster, Gerald Cavendish Grosvenor, is deemed to be the UK's richest citizen.

His US$8.7bn (6.9bn) fortune places him at number 36.

For the 10th year running Microsoft founder Bill Gates tops the overall list, with a net fortune of US$46.6bn (37.4bn).