A few things we need to get straight here.
(1) this is nothing to do with Glasgow, whether in terms of their airspace or their air traffic radar services. The TMZ is for the Lowther Hill radar, used by Scottish
(2) this is not an extension of controlled airspace. You won't need a clearance to enter it and you won't need to be talking to anyone. It will remain Class G airspace where you are free to fly anywhere you want, even IFR, without speaking to anyone.
(3) this is a temporary TMZ, not a permanent airspace change. It will be removed once they've got a permanent solution for the Clyde wind farm (just as they did for the Whitelee wind farm last (?) year).
But I agree it's pointless, and here's why:
if you're in a non-transponding aircraft flying at 3499ft, not talking to anyone, you can fly through the area quite legally. Controllers at Scottish will see your radar return and assume that you are flying below 3500ft - because they have no information on your height. When you're beyond the TMZ boundary you can climb to 5499ft and fly there quite legally. The controller will continue to make the same judgement. He won't vector any aircraft around you because he deems you to be below CAS.
Now, if you fly through the TMZ at 5000ft without a transponder and not speaking to anyone, the controller will still assume (this time wrongly) that you are below 3500ft in the TMZ area. But you are no threat to his traffic because it is all inside CAS at 6000 and above. So the controller's actions will be the same. Primary-only and not speaking to me = not inside, nor seeking to enter CAS, therefore not a factor.
The key question, to my mind, is what recent evidence there is of vertical infringers of this part of the Scottish TMA, and how many of these are non-transponding. I'm prepared to bet it's very very few. But if I'm wrong and it's a significant number, then the even bigger question is, why doesn't Scottish make ALL of the airspace 2000ft below the base of the TMA a PERMANENT TMZ? Because at the moment, Scottish controllers have no way of telling whether a primary-only return within the lateral boundaries of the TMA is infringing vertically or not - unless it's reported as an airprox by another aircraft.
NS