On Wednesday, January 31, 2018 at 5:33:37 AM UTC-5, Justin Couch wrote:
This was the second engine bay fire in this particular glider.
The reason it has the Jets fitted was because the previous motor
caught fire and did a lot of damage.

That's not what Paul told me. The original motor in "GO" was an early
factory attempt at a sustainer, famous as as "less than optimum".
Another owner of this particular design told me he sold the engine/prop
immediately as it was the best possible way to dispose of it ;-)
Anyway, the compact jets permitted Paul to retrofit the jets without
making much change to structure (mostly using existing cutout etc).

...There's another ASH25M here in Oz that has also suffered an engine
bay fire, coincidental or sign of a greater fault?

Absolutely coincidental. This engine bay fire was caused by use of
non fire-proof material in a high-temperature area; subsequently
rectified by the manufacturer (as usual without admitting any fault,
nor admitting there had in fact been other instances).
This time the pilot (a good friend of mine) was incredibly lucky.
During take-off, some-one in the tower noticed the fire and called
him on the radio. He aborted take-off, and again fortunately someone
at the airport had a fire-extinguisher handy and got to the plane
shortly after it stopped rolling, so the fire was extinguished promptly.
IIRC it took more than a year to get everything back to working order...

Hope that helps clarify,
Best Regards, Dave