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.
How many modes of transport are mentioned on the sign? Answer = A.
Cache can be found at N51 23.(A+3)(A-2)A E000 22.(A+3)(A+5)A.