Fergus,
In short, doing licences at a school which is not in the CAA list means additional costs on your return (EVEN if done in Spain, A JAA STATE!!!), but ratings are fine - just a small admin fee to have it added to your licence. (£100 in the case of an IR being added to a CPL)
Plenty of info on this in a recent thread:
JAR ATPL conversion question
IH