From Dorking Cock roundabout take A24 south, s.p. Horsham. At next roundabout turn left (Spook Hill) towards North Holmwood and about 300 yards later turn left into Inholms Lane (sp Leigh & Newdigate).  Car park is on right after another 300 yards at a bend in the road.

The On On is very hash friendly and “home to the £3 pint”.  It is 3-4 miles away depending which way you go.  Use the map link.