 With Bedford withdrawing from the bus and truck markets in December 1986, Millbrook was put up for sale by GM.In 1988 the site was transferred to a new company, Millbrook Proving Ground Limited as part of Lotus and began to offer its facilities as well to non-GM companies.With the sale of Lotus in 1993 Millbrook was transferred to GM Holdings UK Limited, as an independently managed company and began to diversify into all aspects of vehicle testing including emission control.