Naturally Quite Interesting Mystery Cache

The cache itself is a 0.5 litre clip-lock box in a camo bag. You'll be relieved to know that it is NOT at the published co-ordinates!

The final location can be quite busy at times, especially weekends, so please excercise due care, stealth, and discretion when retrieving / replacing. Thanks!

At time of placement the cache contained a pencil, logbook, silica gel sachet, stash card, and a number of swaps. Please do not remove the silica gel sachet.

The co-ordinates of the cache location are: N 51° 3A.BCD / E 000° 0E.FGH

Where:

A = sixth plus third
B = second
C = first
D = fourth times fifth
E = seventh minus fourth
F = fourth plus sixth
G = sixth
H = fifth

Your clue to the source of the numbers you require is the picture shown above.

You can check your answers for this puzzle on GeoChecker.com BUT make sure you change the "W" to "E" when entering your longitude figures, otherwise it will say you are wrong even if your numbers are right!

Congratulations to Cheekster77 on the FTF. What a brainy fellow!