In reply to Solsbury:
We've been to the Foix/Tarascon area (Ariege) for two trips and enjoyed it immensely, but for a mixed climbing/walking holiday I'd think about going a few miles further South, staying at Ax-les-Thermes. Unlike Tarascon it's a lovely little town (small ski resort in Winter) and is very close to The Pyrenees "proper" with all that that implies regarding wonderful walking country.
Much of this is very close, as is a wealth of rock climbing, (there's a little crag actually IN the town and the mighty Dent d'Orlu is next door) but also you can be in Andorra in 30 or 40 minutes and from what we saw and experienced during our Ax stay last September the walking is beautiful.
Finally, for your chance of finding a rope to jump on to, you can go North for half an hour and be at the honeypot Ariege crags - Calames, Sinsat, Auzat etc.
Just a thought. PS what about the Spanish side? Ordessa? Sorry, no first hand knowledge meself.