I remeber the incident. It was a Cranwell aircraft (therefore a 5A) which crashed very close to Swinderby. The instructor was blamed, and the posted report said it must have been the instructors fault as plenty of JPs had recovered from spins before. However, despite the modifications, it still wasn't a pleasant aircraft to spin. Generally, it was beingn but now and again you'd find one that wasn't. As I mentioned earlier, I nearly jumped out of one when a spin went oscillatory. It was very disorientating and it recovered just above abandon altitude, bottoming out below on the recovery! We snagged the aircraft and it was found to be well ouside the rigging limits.