This is Bramley Apple series cache 7 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:
The Location:
N51 10.(A+B)(G-E)(F+D+(E*2)) W000 31.(E)(F)(C+C-E)
The cache is a fake rock. Hint in geocheck.