I believe that the ASK-21 was the prefered glider for the Air Cadets many years back but the Schleicher factory couldn't produce them fast enough to enough volume - step forwrd Herr Grob and his Acro!
So there was little chance of getting a complete set of K21s even by now - and I doubt that 2FTS expected their 'pause' to have lasted this long anyway!
Hindsight is a wonderful thing!
