I tried a year ago to do the JAR in Spain and failed dismally. I could not find one school which could do it because the CAA had stopped the issuance of any licences pending the implementation of JAR OPS regulations, if I have that correctly. The fixed wing side was much better but helicopters were the forgotten ones.
That may have changed in the last six months but I doubt it. I went to the US to do the examinations but I still need to find a flight school to do the ATP ride and I dont feel like going through the headache in the UK.
Good luck and please let me know if you find a school in Spain to do it.