Jerez was also operating a parking slot system (as of autumn 2006) due to restricted parking and extensive upgrade works. The Notam said the slot was to be booked by fax, so when I tried to book my slot (for returning from Morocco) at the control office in Jerez there was some discussion as to whether this could be done in person, rather than by fax as the Notam required.......
For flying in Spain, I'd say it essential to read the up-to-date Notams. Lots of restrictions pop up.
There is a useful GA guide published to all the airfields of Spain & Portugal, pm me if you'd like details.
The other coment I'd make is that while the Jeppesen charts are good for flying, if you can get the Spanish military charts (1:1 million) these are very good for the topography and for flight route planning in both Spain and Portugal.