Single Spey
Some very good points.
Sadly NATS dont give away anything.
I recall an airfield in exactly the situation you outline where I chatted to the guys in AT. Although they had a radar head of their own for various reasons it made sense to have a NATS feed. NATS agreed - £100K per annumn plus installation.
If you go to Calais you will find a radar feed in the tower. It is provided free. It "protects" the IA at an airfield where there is almost no commercial traffic and certainly no scheduled traffic.
IMO the CAA should require NATS to provide a radar feed to any airport with an instrument approach.
Yachts have for years fitted radar reflectors. They are cheap and easy to fit. I guess the cost would be equally small for gliders and micro lights. I agree this would greatly enhance there transparency to ground based radar.