The Co'ords do not take you to the cache, but to a sign. Reading the sign, you will take note of the location as well as what the location is famous for (amongst other things!)
You should have 3 words. Each letter of the words represent a number, where A=1........Z=26, all you have to do is fill in the gaps.
The cache is found at:
N51° A (W-T) . (F+C) (T-M) 8 W000° 4 (T-O) . (O÷C) C (A+W-T)
Where you will be looking for a camouflage bag.
By kind permission of the Blackwater Valley Countryside Partnership