This, clarification of the status of this bit of land, is something the PC have been trying to get from ENC.
Sadly, the current situation appears to be that there is no special designation for this bit of land from ENC's perspective; despite it appearing on various plans labeled as a 'Wildlife Area'.
At the time of the planning application, the PC did request that the roads within the development did not run up to the edge of this bit of land, thereby discouraging it's development. This request was ignored.
So it seems that this bit of land could be put forward for future development at any time.