 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.For drag and stress reasons the operational altitude had to be in the stratosphere, to which altitude the test vehicles would be carried by a parent aircraft, a De havilland Mosquito

The design was to be powered by a 362 kg (800 lbs.