In reply to Fredt:
CyP Arete has nothing as 'hard' as the very start of the Cneifiion Arete, but is more of a standard, and quite scary (very exposed at the point where the route is least obvious). I think it is worth Grade III scramble, but certainly no more. The Parson's Nose, though, is the way to start it. And that's a definite easy rock climb, quite hard to grade. Somewhere between Mod and Diff, on small holds and perfect rock. Probably Mod, but it feels quite something in big boots. Absolutely superb, a perfect solo, leading straight into the CyP arete.