Kevin,
This ac arrived at Yeovil today with a crew to collect a new Merlin and was confirmed as M-517. It has on previous occasions used the c/s M505 which may have led to the confusion. Previous reg was ZK162.
Even more confusing is the fact that today he was using the c/s DAF3360 which is one usually usually used by an AS550C2 Fennec.
Tom