Greywether’s directions are effective. Found the carvings without problems, sans gps despite high undergrowth and the moss on the outcrop.
Looking at rockartUK’s photos and comparing them with Greywether’s, and then with what I found, I’d say the moss is still creeping over these carvings. I visited just over a year after GW, and there was a noticeable increase in the amount of the carvings covered. The temptation to have a scrub of the moss was strong, but I figured it should be left to do it’s thing.