Ah, fantastic info, many thanks!
It also clears up the whole agent/defection confusion. I guess you could say it was a bit of both.
I may be wishing for the moon on a stick here, but does anyone have the fuselage code letters for the mentioned Spitfires - or even photos? I've seen BM515 before as it subsequently served with 322 (Dutch) Sqn. as VL-P, but it would be nice to know what codes it wore with the 165th. SK-something I gather...