 In the same year, de Havilland, Blackburn Aircraft and Folland merged into Hawker Siddeley, which had already consisted of Armstrong Whitworth, Avro, Gloster and Hawker since 1935.Westland Aircraft took over all the helicopter manufacturers, including Saunders-Roe, Fairey Aviation and Bristol's helicopter work.Saunders-Roe's hovercraft work was spun off and merged with Vickers Supermarine as the British Hovercraft Corporation.