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Artist Banksy 'marks Queen's Jubilee'

20 May 2012 Last updated at 11:00 BST

Graffiti artist Banksy is believed to be behind a new painting which shows a boy hunched over a sewing machine stitching union flag bunting.

The picture appeared on the wall of a Poundland store on Whymark Avenue in Wood Green, north London.

A professor specialising in Bansky believes it is the Bristol-born artist's work.

A Poundland spokesman said the retailer enjoyed Banksy's art and said suppliers met ethical guidelines.

But now embraced by cultural establishment, can the graffiti artist Banksy still be considered a subversive radical?

Andrew Marr talks to Will Ellsworth Jones, author of a biography on Banksy, and the Art Critic Francesca Gavin.

You can watch the Andrew Marr Show in full on the BBC iPlayer