Fianccetto: Have heard back from Gloucestershire Wildlife Trust:
I am sorry but we will not give permission for geocaches to be placed on our reserve.
This is an extract from our policy on non-wildlife related activities on Nature Reserves:
'Given the unique function of nature reserves there is a general presumption against any other activity taking place on nature reserves which is not linked to the overarching objectives of conservation, education, research and quiet enjoyment of the countryside. The Trust has decided, therefore, that activities not in accordance with the purpose of reserves will not normally be permitted.'
I have checked this with one of our Directors who has agreed that we will not allow this.
There are other parts of Chosen Hill which do not belong to the Trust so maybe you can get permission to place geocaches on these areas.