Production at Daimler, Hooper's in-group chassis supplier, fell to 110 Daimler SP250 sports cars in 1959, with no saloons or limousines being built that year. Rolls-Royce, and their subsidiary, Bentley, became the main supplier of rolling chassis for the coachbuilding trade. Hooper's management decided to end production of coachbuilt bodies after Rolls-Royce's plans to cease series production of separate-chassis cars and use monocoque construction exclusively became known to them in 1958. Their showroom at St. James's Street closed down at the end of September that year.