For this cache you can park your car at N56 23.813 W03 23.230 to pick up the trail. This is a virtual cache but you must post a picture of yourself at the cache location to prove you were there. Cleverly massaged images from photoshop don't quality. ;) As for the location, the view is spectacular but be very careful as the cliffs have claimed several lives in the recent past. The tower itself is medieval looking, but I've been told it was built and used for training purposes during the war. The trails meander every which way so it's always a good idea to mark where you entered.
Addendum. Canuckinperth has given me the coordinates of the Quarry car park which sounds like a better starting point for this cache than the Jubilee parking lot, which is the one I suggest above. The coord's are N56 23.751 W003 24.272
Also, he was nice enough to do another reconnaissance mission to get the coordinates of another point of intersest N56 23.378 W003 23.998 , thanks Canuckinperth!!