One2go
You may have noticed BEagle as a frequent poster on PPrune, as an ex-military pilot he may be an ideal contact for helping an ex-FJ pilot get used to light aeroplane driving.
Also Andy Cubin at Kemble could be another useful contact. Another ex-FJ pilot.
They will both know how to relate to your experience.
As for PFA types (I operate one and would happily show you it once a bit more work is done to get her airworthy again!) the advantage is that you can do most of the maintenance work yourself, with an inspector to supervise. So you'll be saving lots of man-hour costs that can show up on CofA types. So they'll be cheaper to operate. There are some quite sporty types in the PFA list (go onto their website to see a list of approved types), so you can have fun with aerobatics or just pootle along admiring the scenery, whatever you fancy.
Get a copy of the PFA mag (Popular Flying) to see typical aeroplanes for sale and hence an idea of cost. Alot can depend on ageand capability. But from £10,000 upwards (no limit!). But also look at joining a group (see PF adverts at the back) where for say £30/month and £30/hour you can get to fly some good types, and generally find a suitable group near home.
Happy flying, cheers H