 Early in 1946 the contract for the E.24/43 was cancelled, since it was felt impossible to ensure safe escape for the pilot in the event of an emergency ejection at high speed.The difficulties surrounding flight at sonic speeds appeared to increase with increasing knowledge.In those circumstances, consideration of an improved version of the E.24/43 was discarded in favour of pilotless models which for the initial tryout were to be 3/10-scale versions of the Miles M.52 design.