Reaching the cache area involves a pleasant and easy stroll. It's only a few minutes from the car park, and the box should be easy to find (but be careful of brambles). Please use some stealth if there are muggles nearby, and revive trampled vegetation.
A little simple maths should get you there:
89567541997847
Before setting out, check your coordinates here: 
Uvag va trbpurpxre.