Parking is possible (just) on the road near Ifield and also near cache 12. However the best spot is on the road to Nash Street in the vicinity of cache 1. The walk can be started at any point, but should be completed in a clockwise direction for a number of reasons, not least that the multis work that way.
At the coordinates there will be a low level concrete sign with three words. The number of letters in each word will be A, B, C.
The cache can be found at N51 24.(C-3)(B-1)(B-6) E000 21.(A+2)(C-1)(A+3)