Some people had problems last year getting fixed up with a Spanish bottle. The official route was costly and lengthy. I went to a caravan accessories shop today where my mate got a bottle without any problem. He had to show his passport and give the address of the campsite. He paid 40 euros and got a CEPSA bottle (full) and a regulator. The assistant explained that he was allowed to do this for Butane but not for Propane where a registration document from the gas company is still required. For those of us who do not intend to stay anywhere really cold this would seem to be an improvement.