There are no more planned full closures at M25 junction 10 before 2025.

Take A3 s.p. Guildford.  After 1 mile take Ripley exit
B2215. Go through Ripley, take 1st exit A247 s.p. West Clandon.
After 2 miles straight over traffic lights onto A25 s.p. Dorking.
Continue 1 mile to top of hill and turn right into car park (Drove Road). Park at far end.  Alternatively approach from the opposite direction on the A246/A25.