Originally posted by DirtyDog
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HM Revenue & Customs: Applying for a National Insurance number
"Your National Insurance number is your own personal account number. It is unique to you and you keep the same one all your life."
But those allocated temporary numbers pre about 2001 had no guarantee at all they were unique. Those allocated manually eons ago regionally did cause duplicates. Caused lots of problems sorting out in the early days as systems because centralised; though I doubt there any many duplicates out there now (at least in terms of the living).
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