Cuddy's Cave, just up from the Bowdens, I forgot about that one. Used to have CnRs didn't it?
I like to think there's a few hidden in those trees in the nearby Kyloe Hills too.
and here's some in Millstone Grit - http://www.themodernantiquarian.com/post/16202 - which is the toughest species of sandstone. These have barely eroded since the day they were carved ...