Mikkel
I have no further evidence to add to the demise of EH786 - except I've seen a photo (not a very good one) somewhere of a lineup of Spitfire Mk Vb marked FN-'x' etc, where the captions states these was ex-331 Sqn. aircraft just transferred to 'XXX' squadron.
I've been through my entire collection of books and magazines serveral times to relocate said picture - but no luck. (I'm - almost - certain that this is not something I've dreamt up

)
If the caption is true it seems, that most 331 Spitfire V's was transferred in a bundle to a new unit.
I'm to tired to start digging into the ORB's and Morgan & Shacklady now - maybe tomorrow.
Lars