There is nothing to be found at the published coordinates. To find the cache location fill the coordinates N 51° 54.uvw' W 2° 6.xyz' with the digits from the indicated places on the completed grid below.
The cache is a large micro so there's a small amount of room for small tradeables/trackables. Initially there is a medal and some foreign coins to get trading going. There's also an unactivated geocoin to be claimed as a FTF prize.
Each letter represents a distinct prime number between 2 and 19 inclusive. Each clue is an algebraic expression (following usual BODMAS precedence rules) which gives a (base-10) result. To insert the result into the grid an additional digit, different from any other digit in the result, must be inserted somewhere into the answer. For example, if you have worked out F=23 and G=29 and the clue were FG, the result would be 667 and it would be valid to insert 6697 in the grid. The inserted digit will not be the inserted digit of a crossing clue. There are no leading zeros.
Please note you can download a printable puzzle page.
