Copyright Christie's Images Ltd 2012
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What would you pay for a Constable?

English landscape painter John Constable's work The Lock has sold for £22,441,250 at Christie's auctioneers in London.

But is the painting worth that sort of money - and who would pay that much for it?

Before the sale BBC News spoke to people outside Tate Modern in London to see if they could guess its value.

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