OK Lads,
I have had it confirmed with RAA....
If all maintenance is carried out, as per the ROTAX requirements (rubber replacements etc etc) and is all documented, then the use for private use only is supported by RAA running "on condition" past the 15 years. Of course, no hire, or flight school etc, which makes some sense. But to rip out an engine from an aircraft with only 400 hours on it, when it has not given one lick of trouble, is mad, and gladly agreed to by RAA. ? Happy days.
J