You are looking for a regular-sized cache. The co-ordinates of which need to be calculated using the first number found on each lamp post at the given waypoints below.
The final location is here:
N 51 IC.(G+H)(F-D)(A-E) W 001 (I+J)(A+B).(C-D)E(F+I)
There is plenty of parking available in the area.
The final location is not wheelchair or pushchair friendly - sorry!
NOTE: Unfortunately GZ can be prone to litter. I will try to visit regularly to keep it tidy, but why not bring a bag and pick up a few bits of litter yourself? Please be careful though :)