Keeping his identity a closely guarded secret, the graffiti artist, Banksy, has made a name for himself with images stenciled around the streets of London, Bristol and other cities worldwide.   Robert Banks, born 1974 in Yate near Bristol uses topics such as politics, culture and ethics when creating unique street art that has been bought by the rich and famous including Christina Aguilera and Brad Pitt.  Original Banksy street art is now selling for upto £100,000 at Sotheby’s in London.