The cache cannot be found at the published co-ordinates.
But it's not too far away.
It contains a logbook only.
Solve the puzzle and find the cache.
-2 TAP
-1 HUT RUDE WIP
1 ADIT GAP MOO RUIN
2 FOE KIM RIG
3 COB
4 PRO
The cache can be found at N51 34.(A*D) W000 25.(B*C) where
A = HUT+WIP+RIG-MOO
B = FOE-KIM+COB+RUIN
C = TAP+GAP+ADIT
D = RUDE*PRO
