The above coordinates are not the cache but the parking location.
To find this cache you will need to visit our two other local caches,Pond Bay, Spawn Number 1, to obtain the coords.
As Spawn has been disabled and archived the clue there is 51d01.262N
This can be attempted by backtracking along the same paths or via a longer circular walk via Hurst Green, as per details in the Pond Bay and Spawn No. 1 caches.