The prosecution had alleged that the conspiracy was hatched in a series of secret meetings in New York and London between Taubman and Sir Anthony Tennant, who was Christie's chairman from 1993 to 1996. They were followed by high-level talks between Diana Brooks, Sotheby's chief executive, and Christopher Davidge, her opposite number at Christie's. Brooks, who was nicknamed 'the Terminator' for her tough management style, is due to be sentenced next week.