This is Bramley Apple series cache 12 by PuzzleClub, a joint account for Hofficoffi, RichieCactus, ===sgb and TheBignells.
The cache is not at the posted co-ordinates, solve the puzzle below to find it. 
The Puzzle & Location:
An excess of horse droppings had issues for organising UK town cleanliness.
Given ABCD, the cache is located at
N 51 1(C-B-A).(A+B)(C-D+A)(B-A-A), W 0 3(D-A).(C-B+A)(B-A-D)(A+A+B-D) .
