In order to find the final location of the cache you will need to answer the below questions. The answers to these questions can be obtained by standing (or sitting) at the starting point.
Cache Coordinates:
N51 17.(A-4)(B-1)C
E001 03.B(C-B)(A+B+1)
Questions
A = The number of trees in the centre of Dukes Meadow Field
B = The number of football goals on the field
C = The number of wooden panels on the bench (you may be sitting on)
Once you locate the cache please remember to re-camoflauge the container so that it isn't discovered by non-geocachers.
Congratulations to mankybadger for being FTF.