 Vickers Transonic Research Rocket was developed from the Miles M.52 a British research supersonic aircraft a project which was undertaken in top secrecy between 1942 and 1945 to a Ministry of Supply specification E.24/43.The project was cancelled because the Government of the day was persuaded that with the accumulation of data it was felt that the E.24/43 aircraft was unlikely to reach sonic speed.Wind tunnel model tests apparently indicated serious loss of longitudinal stability at high subsonic speed as was then characteristic of existing aircraft.