The construction of new buildings, and changes of use of existing land and buildings, within the Green Belt or Metropolitan Open Land, unless there are very special circumstances, will be inappropriate, except for the following purposes:

1. Agriculture, horticulture and woodland;
2. Nature conservation and wildlife use; or
3. Essential facilities for outdoor sport and recreation, cemeteries and for other uses which complement and improve access to, and which preserve the openness and do not conflict with, the purposes and objectives of the Green Belt or Metropolitan Open Land.