Warhol's you have never seen

He is one of the 20th century's best known artists - but here are the Andy Warhols you have never seen. The collection of 25 portraits goes on show for the first time in London today after the Warhol Foundation in New York authorised the release of the images. 

Many of the subjects are as famous as the artist - Giorgio Armani, Muhammad Ali, Michael Jackson and Liza Minnelli are just a few of the stars featured in the exhibition. 

The works were released by the foundation - which oversees Warhol's hugely lucrative estate - thanks to the perseverance of Gul Coskun, director of the Coskun Fine Art gallery.

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