Chris Ingram is a silver-haired, incisive man, with an air of quiet authority and decided opinions about the art he so passionately collects. A media entrepreneur who started work at 16 as a messenger boy in an advertising agency, Ingram has the strength of his convictions. Over the past dozen years he has built up a remarkable collection of some 500 paintings, drawings, prints and sculptures, of which 350 belong in the category described by auctioneers as Modern British.