In reply to mark hounslea:
As Phill Mitch said, you can camp just below the refuge. There is a nice area under trees with a wooden table and benches where a few tents can be pitched on grass in pleasant shade. There is also a small stream flowing through the campsite, good enough for washing. It is best to buy a few large 5l bottles of water for drinking before arriving to Riglos. I spent a week there last year and I recommend the place. I believe the place was used by locals when the refuge was being refurbished. I found it really pleasant. There is a short path from the campsite to the refuge, where you can buy great food and ask for a key to the shower (there are no facilities on the campsite itself). And both the camp site and the refuge are close to the main rock towers.
The place is not in plain sight (which in an advantage in itself), so it is easy to miss it if you do not know what to look for. Just before the village of Riglos the road turns right. There is a viewing point at this road bend, with two plaques commemorating Alberto Rabadá and Ernesto Navarro among others. Just after this bend there is a small unserfaced road going down and left directly to the campsite (about 200m). It is steep and uneven, so be careful if you decide to drive there, but we managed to drive there fine with a Fiat 500. There is space for two or three cars. It may be a good idea to check if it's not too busy before you drive down, as it may be hard to reverse if there are a few cars already. Having said that, we were the only people on the campsite during our week in Riglos in April last year.
We opted to stay on the campsite, but we ended up buying lots of meals in the refuge, the food was fantastic and served as a good excuse to ask for the key to the shower
This can be obviously avoided to lower the cost. The people in the refuge and the refuge itself made a good impression on me, despite poor state of the shower.