Some of us where at the original meetings to decide use of the land. The Actual reserve right at the end is off limits to bikes (but it you just ride through the fireroad I am sure no one will care)..
Horses and MTB's were allowed to ride out there with a Group booking permit. At least this is what it was originally. Try to find someone at Council to get a permit of and good luck to you.
At the first meeting that I went to with Oppy, I think me and him were the only MTBs (he went to more meetings after this one) but the Horse riders had a much stronger lobby group, Thus is probably was decided along time ago to build that new area, The coucil does move at such a fast pace. It probably has nothing to do with someone from the Polo set.
Bogwheel, I don't know how long you have been riding out there, but I know most of the people responsible for putting in most of the single tracks we ride out there. If you would like to know PM me.
This thread is getting off topic and away from Castle hill. Rode Castle on Sunday morning, and yet again some of the loops have managed to repair and reappear again. Had a great ride.