With the anonymous maverick getting richer and richer – he is said to have a fortune of $50 million (£40m) and counting – read on to discover the 15 most expensive Banksy artworks ever sold at auction ...

Plus, if you time it right, the setting sun will fall between the bastions of Tower Bridge as you approach ... Underneath Waterloo train station is the Banksy Tunnel. Banksy Tunnel was named in 2008 ...