Thanks for that. As no Airspace Change Proposal was raised, maybe the CAA should rescind it ?
Just a wee update, there is nothing in
any of our ATC documentation about us being the proud owners of a TMZ, and after asking around a few folks, it seems none of the guys and girls who work the airspace knew we had one either.

It seems that the CAA (with or without telling our management) slipped in the change to the ANO some time ago (2005 ?), coupled with an appropriate AIP TMZ entry. The effect is to give us what we always had (Mode A&C transponders required above 6000' in the TMA) but without educating the foot soldiers that there was a subtle change afoot.
The change would appear to predate the CAA Policy promised in their Phase 2 Mode S consultation that all TMZs should go through the Airspace Change Proposal. As they have regulatory power to impose TMZs whether consultation occurs or not, they appear to have done so anyway without letting us know.
Wonder what else has sneeked in under the radar, so to speak ?