Im trying to find a picture of Leo Houlding climbing (what I think is) The Tubes near Betws y Coed. Im sure I saw a pic of it in an old mag, its him climbing a black looking bouldery bit of rock above river rapids.
In reply to Joss: The problem is called Leo's edge. As you mentioned it's in the Tubes. It was in the Tubes article back in an old OTE magazine i think.