The heavyweight of the night was Jean-Michel Basquiat's untitled work from 1983. Conceived in the style of a classical frieze, the triptych sold for $8 311 049 (£6 492 500) against an estimate of  £4-6 million. The piece has perviously never before offered at auction and had been in the same collection for 20 years. Basquiat continues to shine at auction, in the past twelve months at Sotheby's, all but one of the paintings offered by the artist have achieved prices above their high estimates.

Andy Warhol's much publicised Self Portrait, 1963-64, brought the second highest price of the evening, selling for $7 691 801 (£6 008 750) well over the £5 million low estimate. The piece appeared at auction for the very first time last night, 30 years on from the artist's death in 1987. Artworks from this period typically attract the strongest prices for Warhol at auction, with eight of the top ten auction prices for the artist coming from the years 1962-4.

During the important summer art calendar in Europe, following Venice, Documenta and Basel, London is the final stop for collectors around the world. The June auctions are at the heart of the vibrant London art scene at this time of year, making for busy views, packed salerooms, and real competition for the art on offer, as we saw tonight,'' commented Alex Branczik, Sotheby's Head of Contemporary Art, Europe.