Colin Gleadell combed through the London Contemporary art sales looking for significant sales and price movements:

With a record £413,000 for Polish American pop artist Wojciech Fangor, Bonhams could be about to become a contender in this market.

Some younger British artists made record prices during the day sales:

A boy precariously balancing a pile of books by Yinka Shonibare doubled estimates at £137,000; a portrait of Cara Delevingne by Jonathan Yeo rose over estimates to £100,000; and a 1960 used book collage by the underrated John Latham, the subject of a retrospective now at the Serpentine gallery, sold for £56,250 – all auction records.

Gutai’s artists who are not Kazuo Shiraga are getting bid up:

A rare surviving torn newspaper work by the performance artist Shozo Shimamoto from 1951 sold far above its £80,000 estimate at Bonhams, for £293,000. A 1959 abstract swirl by Tsuruko Yamazaki, who has never reached over £20,000 before, sold at Sotheby’s for over 10 times the estimate at £200,000.

The winners and losers from London’s £286 million contemporary art sales (Telegraph)

Restoration and research reveals a genuine Stubbs; Dreweatts’ Jan Krugier sale triples estimates (Telegraph)