The start of the coordinates to find the cache are: N 052 44.??? W 001 38.00?
To work out the missing coordinates and find the physical cache...
NB: a=1, b=2 c=3 etc when numbering the letters
N: Number on the power cable pole (stage 1) x 41 + Number of first letter on the metal post (stage 2)
W: Number of the second letter on the metal post (stage 2) - number of the first letter on the power cable pole (stage 1)
Bring tweezers and a pencil. Please can care when putting the cache back in place.