Colin Gleadell has Christie’s top lot for the Frieze Fair sales:

a rare self-portrait by the eccentric German artist Martin Kippenberger (pictured), which carries the highest estimate yet for the artist at £2.5 million to £3.5 million. Kippenberger died in 1997 aged only 44, and was featured in a retrospective exhibition at Tate Modern in 2006, where this painting, which belongs to an old friend of the artist, was included. Now something of a cult figure, his works are handled by major galleries including Gagosian and Hauser & Wirth, and his prices on the private market have reached as much as £4 million or £5 million.

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