>Please elaborate, because that sounds most intriguing

They are geologists who had seen photos of eroded RA and thought that the carvings were natural features, which, given the existance of marvelous things like these: http://www.themodernantiquarian.com/site/3247 is sort of understandable.
RockartUK invited them along to show then that there are freshly pecked motifs, and upon seeing the likes of this: http://www.themodernantiquarian.com/post/37309 which convinced them that these are the results of human activity.