Here is a quick cipher that you can try on your laptop at home (or in Peppard).
Assuming N51 and W000, the cache can be found at:
The cache is a magnetic micro in the most obvious place. Please bring your own pen/pencil.
The listed coordinates are for a random point in a nearby wood and have nothing to do with the puzzle.
You can check your solution at:
***FTF*** Fast work wrightexplorers!