In reply to Compo:
Hi Compo
There's a stack of great places to go bouldering in Spain.
The current hot venue is Albarracin. It's a fantastic place with a red sandstone (El Rodeno) which is kind of like a combination between Font Sandstone and Grit.
There's a lot of bouldering around the Madrid area. Here you get to chose from El Escorial, La Pedriza, Penas Blancas, Zarzalejo to name a few. Out towards Avila you have Navalosa and beyond there up near Bejar you've got bouldering at Candelario. All granite.
Over by Barcelona you'll find the excellent Can Boquet. It's near to the coast and so you can split your time between the beach and the boulders (which are inland)
There is limestone bouldering to be found in the North. Laraona and Las Tuerces are two places worth visiting.
There is good bouldering at Siurana. This would give you a choice of routes and bouldering.
Around Llieda there is some good sandstone bouldering. It's pretty nails there and the areas are spread out. But it is worth the visit if you're on form.
Here's some video clips from Albarracin, El Escorial and Candelario:
If you want more info on a specific area then drop me an email. Happy to help you out.
Cheers
Luc