Unusual in having real flaps .... and a retractable undercarriage (which wasn't common back then... though everywhere now) ..... from a pilot training point of view it replicated future workloads better than most gliders of the period in having one of most things the pilot would go on to find on later airframes as they moved up the pecking order of performance and complexity.

I wonder how many there were active in the UK? ... and if any still fly ... they had main-spar fatigue issues and were stopped doing aerobatics by the powers that be.

K