LONDON.- Agnew’s, one of London’s leading international art dealers, has appointed Sir Thomas Lighton as its new Chief Executive and is moving to a gallery in Mayfair in the heart of the capital’s art world. These important changes herald the beginning of a new era for the prestigious, long-established gallery which will see a gradual move towards greater involvement in 20th century and contemporary art, whilst continuing with its more traditional dealing in Old Master and British paintings, drawings and watercolors. Previously Tom Lighton was Managing Director of Waddington Galleries in London, which