Another Banksy work on offer is an Edinburgh street bollard which was tagged with a Gangsta Rat holding a boombox in 2009 and is expected to fetch between £20,000 and £40,000. The collection of ...

Ha – only joking. While Banksy is a relative newcomer to the graffiti scene, Blek le Rat has been stencilling, pasting and daubing his way around the world for nearly thirty years. But the perception ...