Gosh, Xose, I'm glad you mentioned that. I asked a (Spanish) girl here and she says she's fairly sure that they will ask for a Certificado de Empadronamiento, so I'd have gone through all the hassle and queuing for nothing. The campsite owner says he'll write me an attestation in the morning, so that I can get one from the Ayuntamiento before going to apply for the NIE.

Another question, although I supose it'll be answered when I apply:
My British passport (I am British) is still in my married name, although I've been divorced for ages, but all my other papers are in my maiden name, because I've been living in France and they do everything in your maiden name. I think the officials in Spain will want a passport from my country of nationality, won't they, rather than an ID card or Carte de Séjour (residency card) from France? Shall I just take everything and see what happens, or what? When I renewed my passport through the British Consulate in Paris, I did ask for it to be in my maiden name, but for some unreason they ignored my request, so I'm stuck with a passport that doesn't match anything else. I'm loth to apply for a new passport, as it takes a while and costs so much. Should I try just using my French ID card, that's in my maiden name and matches my driving licence, etc,. or will they want a passport? (I've only used the French card so far, to register at the campsite and so on.) perhaps if I get the Certificado de Empadronamiento with the French ID card, the rest will follow, or will they insist on a passport. (Even the Pensions Office in the U.K. uses my maiden name - it's only the passport that's wrong.)

I could just use the passport and if they ask why my driving licence, etc. are in my maiden name and are from France, I can explain. Perhaps that's the answer - but then, if I get an E121 and it's in a different name... I can feel my brain frying.