Record-breaking bids are made as the work of the 19th century naturalist John James Audubon goes under the hammer. Meanwhile, the Duchess of Windsor's jewels come up for sale.

Series exploring some of the most intriguing and pricey pieces to pass through the world's greatest auction houses. A snuff box made from timber from the HMS Victory is sold in London.

Emile-Jacques Ruhlmann's chaise longue 'on skis' attracts big bidders in Paris while, in London, a Warhol portrait of Debbie Harry and an intriguing sketch of the Queen go on sale.