In reply to chris_j_s:
Sorry, I hadn't realised I had. I think I wrote something along the lines of:
From what I have been told people have tried TE. There's a blank section, however, that I have been told is "impossible" by modern standards. In this blank section there's also a rock scar in a place in which it seems probable that at one time there was an undercut, and if there was an undercut there the route would be possible.
Whether that undercut is the same one that Jerry pulled off I don't think anyone knows.