In order to claim this cache you will first need to visit the Header co-ordinates and discover the year in which the Board of Trustees made a contribution.
But before that, you have a puzzle to solve. This will furnish you with the co-ordinates for the cache itself, which is not more than a mile away.
Please be aware that there is a Park Run every Saturday morning. The park will be busy until lunchtime at least (or, if I'm taking part, sometime next week!)
See also:
Cliffe Castle Park Wee One