The cache is high in a tree and you will need a long pole to fetch it down (and put it back, of course!) Please don't even think about trying to climb to it, the tree is far too flimsy for that.
The cache is a long walk from my suggested parking. I have tried a shorter approach through the sailing club, a path (though not a right of way) is shown from the B376 but I cannot find this path on the ground. You can drive under the motorway from the suggested parking and get a few metres closer, but the road is fairly narrow there.