There has been numerous rumours about PPL flying AEF, but nothing has come of it yet. As far as I'm aware you have to be a (any of the services) service pilot or ex service enrolled in the VRT with a min of (i think) 2000 hours or there abouts. It may have changed recently though.
You could give OC 12 AEF a ring at Leuchars who could maybe advise better? I think they have regular detachments to Glasgow and Kinloss