XV865 would have made a good acquisition for the Fleet Air Arm Museum collectio if they didn’t already have a Bucc Mk.2.

You do make a good point though, There were a few former FG.1 Phantoms at Leuchars at one stage, all of which have FAA pedigree unlike the prototype in the FAAM.
Before that, the RAFM flogging off the P.1B XA847 because they got a Lightning F.6 from Binbrook. I’m sure they have another ‘unremarkable’ Lightning (a pre-production aircraft?) in the collection that surely could have been sold instead?