Spanish Will

Living in Spain as an ex-pat we obviously have assets in that country, a villa, a car, bank accounts etc.
So it came to pass that we needed to explore what happens if either of us dies or we both die. This came a more serious problem after my uncle died recently and I was the executor of his will. It sparked us into life. The question was, what happens in Spain?
We did not need to see a solicitor in Spain, we had to see an accountant who helped us draw up the wills and help avoid taxes (an absolute must for the Lady of the Villa who hates paying anymore taxes than she has too!).
Once the will was drawn up it had to be notarised by a Spanish Notary, then legally filled with us and the accountant holding copies. All very straight forward, except any beneficiary of the will has to have a Spanish NIE number. This is the equivalent of our National Insurance Number (the one you get at birth but can never remember).
So our children will have to apply for one if they ever want a share of our Spanish assets.