Well, I'm not sure the Luton (actually Stansted) TMZ is relevant because it's permanent. This isn't.
an area where presently there is no transponder requirement - or much prospect of an ATC service
I agree with the first bit but, with the greatest respect to fisbangwollop and his colleagues, there is actually NO prospect of an ATC service because if you try to call one of the Scottish Control frequencies below the TMA, and aren't intending to climb into the TMA, you will be told to call Sc Info who of course are not radar-equipped. Sc Info will then tell you to squawk.
What I don't get is why the current situation, before this wind farm is built, where a non-transponding light aircraft can climb into the TMA in this area and controllers will continue to assume it's remaining below CAS, is deemed acceptable, but a future situation, when the wind farm is built, and non-transponding aircraft still climb into the TMA, is considered unacceptable.
NS