A rare portrait of two young brothers by Titian is the highlight of an Old Masters sale at Sotheby's. Meanwhile at Christie's, some Cartier jewellery is being auctioned.

A sketch by John Constable is expected to fetch \u163\'5f300,000 at Bonhams, while Sotheby's is selling the art collection of music legend David Bowie.

Bonhams is auctioning 10 cars that tell the story of early British motoring, including an 1897 Daimler, which could fetch up to \£250,000.