In reply to purple sue:
Eight hours? It's 1800km!
Chateauxvert is a great crag in Southern France and the carpark across the road has a composting toilet. There's "no campervan" signs there, but we stayed in a laybay half a mile down the road for a few nights with no issues.
Mula is a good crag in the Southern Costa Blanca, about half an hour from Murcia. We van-camped there, nice and remote.
Also stopped over at Archidona, only 5 minutes from the motorway but it's only a few hours from El Chorro so you're almost there by then.
Good luck. Rick