Street art was once simply graffiti, a sign of decay that lowered property values. Fast forward to the transformation of London's East End and it became cool. Seen as 'gritty' and 'edgy', street art generates interest in an area. Refashioned, and made acceptable, it transforms public space as areas become high-priced, trendy and attractive to the emerging creative class. Its 'edge' and sense of 'authenticity' become a means to speed up gentrification...