Hi Janette,
Would you believe I am looking into this as well?
I have the chance of buying a LHD, Spanish registered Renaul Clio, with current ITV (MOT) and I am weighing up the options. I stand to be corrected by more experienced members of this forum, but here are the choices as I see them.
1. Buy a british registered car LHD or RHD and use it in Spain. Either drive it down and make a bit of a holiday of the journey, or get it transported down by a recognised company. I'm told officially you are only allowed to use a 'UK registered vehicle' for 6 months on Spanish roads before you need to have it registered in Spain, although several people I know stretch this law. One of the conditions for using a UK car in Spain is that it must have a valid MOT certificate. Unfortunately this might mean you have to get it back to the UK once a year to have the MOT done. That could turn out to be expensive and a pain.
2. Buy a Spanish vehicle and keep it in Spain. There are a few hurdles here as well though. I think to buy the car in the first place, you need an NIE, which most of us have these days, but to get it registered at the local office, in your name, you might need a Padron which in itself has further legal/taxation implications.
3. Storage. Hypothetically, do you pay to have the vehicle stored professionally in Spain and then when you arrive/depart someone brings/takes the car, or do you leave the car at CdA, with keys in your apartment and get a taxi to collect you/drop you off at the airport when you come and go?
4, I am also looking into the posibility of my family and friends using the car when they are staying at our apartment, but I'm guessing 'hiring' out the car would be a legal minefield.
I will keep you informed of what I find out.
Seeya later
WW