Line of Sight to Stokenchurch (Aveltray Ugbay) Mystery Cache

One of a growing series of puzzle caches with the common theme being that they all offer a direct line of sight view of Stokenchurch Tower. This one may bug you but if you're not too half-hearted about things and travel a little you'll claim the find.

The Puzzle

The cache can be found at:

N51 39.324+J W0 55.660-E

Update 12th May 2018: Those looking to claim this cache may be pleased to hear that an alternative method now exists. See GC7PHFC.

You can check your solution at:

Congratulations to Miss Chief for the FTF!