Graffiti artist Banksy was today embroiled in a tit-for-tat row with another street artist after deliberately spraying over a 24-year-old work.

The elusive aerosol painter has caused outrage by covering up a piece of graffiti that had remained untouched since it was painted in 1985.

Its creator, Robbo, a hugely respected graffiti artist, immediately retaliated by spraying his name over Banksy's painting of a workman on a wall in North London.