This is the BONUS cache that is at the end of the trail. The cache is not at the headline co-ords. There is a sum in all three caches leading up to the this cache that you should have calculated to give you the correct co-ords to find the cache.
The cache can be found at N 50 58.(A)(B)(C) W 003 12.((D)(E)(F)
If you have parked up you will need double back the way you came which will lead you straight back to the car!
Hope you enjoy this little series!
Happy Caching! therootgroundzero!