Second hand cars hold there value much better here than in the UK. Have you thought about buying a LHD car thru ebay or something similar and importing it?
We have imported 2 cars now and with the LHD one it was much cheaper than buying the same here…the RHD was hubbies that he wanted to keep!!
The only thing to be careful with is that you pay quite a large first registration tax (first reg in Spain) and its based on the list price of your car here!!
I have previously posted the steps needed to import a car and now we know how to do it, its not as bad as I first thought!!
However, I am surprised that with the UK reporting loads of Brits having money probs over here and selling up and going back to the UK that you could not pick up a car that way, might be worth looking on other expat forums.