The co-ordinates above are not for the cache site, but suggested parking once you have solved the puzzle.
Like The Su Doku Challenge Part 2, you have to have collected the grid for this cache from the previous one.
The monument you have to visit is in Priory Park, though the cache itself is on Reigate Heath. Use the parking waypoint below for priory park.
Please be careful retrieving and replacing this cache: MUGGLE ZONE!
Please use some discretion when making your log. Making things too obvious will spoil other people's hunt.
You can check your answers for this puzzle on Geochecker.com.