The first Harry Potter book was published in 1997 with a hardback print run of just 500, each of which is now worth £40-50,000. Since then the seven Harry Potter books have sold nearly 500 million copies and the eight films based on these books have grossed £6.5 billion, making J K Rowling the world’s richest author with a fortune of around £600 million.

Six buildings in central London are royal palaces – but only three of these (Buckingham Palace, Kensington Palace, and Saint James’s Palace ) are still used as homes by members of the royal family. In addition, Clarence House is a royal home but not a royal palace. Three older palaces (Placentia Palace, Richmond Palace, and Nonsuch Palace) on the outskirts of London have now vanished except for memorial plaques while Windsor Castle, Hampton Court, and Kew Palace are intact and open to visitors. Windsor is the royal family’s oldest home, and where Saint George’s Chapel is the final resting place of many monarchs, including the late Queen Elizabeth I.