The cache is a bonus for those who find all the clues along the route of the Aston Tirrold to Cholsey walk.
The final can be found by working out the following formula. Clues are in the last 4 caches of the walk. Look for the values of A;B;C;D in the lids of the caches. Replace the values into the formula below
Final cache N 51° 33.C(B+D)(B+D) W 001° 10.(C+D)(B-D)(D*2).
Please be careful at the cache site as it is on a steep incline.
Please replace the cache as found. (ie:- please cover it as found.)