In reply to Goucho:
Good thread. Assuming nobody's beaten me to it:
- Can Strapadictomy be classed as an arete? It's certainly vaguely based on one in its upper reaches, but its crucial holds - the vertical crack, the layback pocket/eventual foothold and the horizontal edge - are not arete features, and the climbing style isn't "aretesque" in the traditional gritstone manner.
- Mortlock's has arete in its name but, as I recall, not much in the way of arete climbing.
- It's ages - like about thirty years - but my recollection of Lucy Simmons is of a face climb on the front of the tower, ie between the two aretes, quite possibly making use of one or the other or both, but not an actual "arete climb".
- Memory Lane certainly finishes up an arete, or rather a groove in one - Epitaph - but is substantially a face climb.
A couple of other routes with arete in the name probably don't actually climb one, but I'm possibly getting pedantic and completely missing the point - and the spirit - of your thread; hell - it's pouring with rain, and anything has to be better than watching television!
Respectfully, I would suggest Curved Air, Spare Rib, and possibly Integral Direct (memory's fading) at Pant Ifan, and Jelly Ache at Cocking Tor.