The graffiti known locally as 'Kissing Coppers' was originally stenciled by Banksy in 2003. It was vandalized and repaired several times over the years until 2008 when the owner of the building on which it was painted had the art, much of which was no longer Banksy's original work, transferred to canvas and replaced with a replica, seen here behind its protective sheet of perspex.
http://virtualglobetrotting.com/map/graffiti-by-banksy-20/