In reply to Jimmy2977:
Places de Esquilleu is good for this, it's in the Hermida gorge that runs north from Potes. Lots of grade 4 through to 6a. It's in the Roca Verde guide if you know anybody with a copy.
There is also a guidebook in Spanish called Picos de Europa, 37 vias de escalade clasica de III a V grado. It has good photo topos. This has a good number of easy mountain routes you can do off the top of the Fuenta De cable car. However, I got this guide to provide back up plans for a trip with friends if we couldn't climb our main objectives, so haven't actually done any routes from this guide.
To be honest walking around in the higher Picos is pretty scrambly in its own right and gets you into some amazing places.