Originally posted by BolshieBastard
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It can't be both...
FWIW NINOs are in fact, if not in theory, not guaranteed to be unique. A friend of mine had no end of hassle a few years ago because her NINO, issued when she came to live here from The Netherlands, was also issued to another person less than two years later. She was working, and paying NI contributions, at the time.
It was only when she moved jobs that the matter came to light, and it took ages to sort out the mess at the IR (as it then was) and NI Office.
Using an NINO as a primary key (which is what appears to be happening in the case described by ADA) is doomed to eventual failure.
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