Harts Hill Hideaway Mystery Cache

This cache is on a little known path, one of the few that link Thatcham with Upper Bucklebury.

The cache is NOT at the above coordinates, but they do mark the start of the footpath; please approach from here and not Harts Hill Road, which is dangerous for pedestrians. There is ample parking at N51^o 24.510 W001^o 14.793, a short walk away.

To find the cache location, you will first have to solve the crossnumber puzzle below, devised by Junior Ferret. This is like a crossword but the answers are numbers, not words.

Crossnumber clues:

Across                                    Down

1. A square number                2. A cube
4. A Fibonacci number             3. 6 down - 7 across
6. A square x a palindrome      5. A square
7. A prime                              6. The reverse of 7 across

Substitute the digits from the lettered boxes above in the following coordinates which define the cache location:

N51^o 24.(A-B)(C+D)E W001^o 14.FG(H-J)

Happy solving!