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.

For many visitors to London, one of the iconic sights of a trip to the capital is a traditional London red double-decker bus. Known as a Routemaster, these buses was designed in the late 1940s and manufactured until 1968 when production stopped, mainly because their open back doors – which were one of the attractions for many Londoners – made them unusable by those in a wheelchair. They were still used on many routes until the early twenty-first century and some can be seen occasionally on routes such as the Routemaster Heritage Route 15 which runs from Blackwell to Trafalgar Square.