Without divulging the price, the collector asked the former Citibank Art Advisory vice president for an assessment of its market value.

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He was so convinced that by his production over the past several years, he held out of training camp in attempts to have the his team, the Jacksonville Jaguars, agree with his assessment of his market value.

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When evaluating a potential purchase, an entrepreneur like Courtauld was looking for an assessment finely balanced between market value (a good price), quality as a work of art (a question of informed taste and a good eye), and stature of the artist (now and in the future).

BBC: A Point of View: The art of collecting

The market value of the stock is only 35% of book value, a very pessimistic assessment of future viability.

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The PVT has two parts - an assessment of public value, carried out by the BBC Trust, and a "market impact assessment" carried out by media regulator Ofcom.

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