Originally Posted by
India Four Two
Very distinctive aileron in the first picture suggested a Slingsby product. The second picture and the "pivotal capability" clue leads me to the Kirby Kite, which was used in radar trials at Worth Matravers.
I found this wonderful article by Phillip Wills about his participation in the trials:
https://www.key.aero/article/battle-...glider-flights
It is behind a pay wall, so unfortunately cannot read it. Is it about the flights over the channel in a German sports glider, believe it was a Minimoa.