Thank you all for your sensible replies.
The aircraft I've seen is more the size of a C208 and sounds more of a turbine than does a C210. One still night recently there was no doubt it wasn't a piston.
Also, if it's taking high res piccies, why does it fly above cloud and on occasions beyind the end of daylight?
Nonetheless, I'll look it up on Flight Aware as you suggest. Thanks again.