I have spoken to another local guy, he's going to get me Jock's phone number. However, he has already told me roughly where the carvings are, and I know the area reasonably well (give or take 30 years or thereabouts...). I shall be visiting probably next weekend or the following week and will post any photos and a decent description of how to find them for all other interested parties. Going to ask ScottY to scout the area as well, as he has discovered several other such carvings on our Megarak jaunts. If there are any more around he'll find them!