Vigilant early retirement
Engines I suspect that there may have been some issues with the Vigilants engine life and use on an 'on condition' basis.
whilst not an issue if used for AE work the thought that a minor may be going solo in a machine may well have caused some ripples in the system.
The Vig was designed as a TOURING MOTOR GLIDER not a circuit trainer, yet it has performed well despite being operated at a high all up weight. Climb speed should be to give correct engine cooling and not best rate of climb, and shut downs in flight in accordance with a prior cooling period to prevent shock damage to the cylinder heads. The dear old VW based engine seems to have coped quite well with this (as I would expect) and indeed if operated with due care and under weight has plenty of service life left as new parts are readily available.
Any future use in conjunction with the LAA would incorporate an ongoing engine re life plan which of course the LAA are well placed to oversee.