....the guide descrobes a conspicuous boulder above Llechog with pocketed sit down starts?
As for Nige's RH variant, I was under the impression that he held a right hand undercut, then came up with his left hand to the holds around what you call the tick marked hold (I don't think it is a tick mark - rather it is just a streak of white in the rock). I could be wrong though, as I haven't actually tried it this way.