Regarding the need for an NIE number. If you apply at a Police Station in Spain you simply return to the same place to collect your number when it is ready. All well and good but you’ve got to be in Spain to do that.
We applied for our NIE numbers at the Spanish Consulate in London (there is another one in Manchester I believe). Visit their website for the necessary instructions then turn up (no appointment necessary) between 0930-1330 Mon-Fri. They charge you ?22.00 (cash only) to process your application.
They send it to the appropriate authority in Spain who in turn send a letter with the NIE number to your nominated Spanish address.
We don’t yet have a Spanish address so we used that of some friends who already live there. Equally suitable would be your estate agent or, better still, the address of your abogado.
As a matter of interest you do not actually need your NIE until you complete on your purchase, so you will have employed an abogado early enough in the proceedings to use his address. Our numbers took 6 weeks to arrive.
Going back to the application procedure in London you can download the necessary form from the website. It is in Spanish but very easily translatable. It must be correct in all details before the consulate staff will accept it. They do not have time to correct your mistakes or carry out translations. In particular make sure your reason for needing an NIE is completed as well as the Spanish address.
As we have learnt the goal that is Spain is only gained with a bucket full of patience!
Best of luck,
Phil