Hi blemdookie
have added amended map, with Sect 12 on. Must have overlooked it on original, sorry all. Yes that area is quite hard to pin down, most of the others are well sign-posted. There are small concrete posts inserted into the grass along the main path, painted off-white but there are no numbers on yet. Staff say they will get round to it soon.
Anyway, sect 12 - carry on the main path from the entrance, keep to the left of the office (sign 3B) and follow path all way to the end, as path turns right at bottom =sect 12. Had a look today and not many stones in that area. Happy hunting
Davie