Talk:National Insurance number

SR?
My NI number starts with SR. What does that mean? I can't find any info online. Could someone add a bit more to this article?

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"The NI number is unique without the suffix letter"
This doesn't seem accurate, my NI number is identical to another person I know (born same day), but with a different suffix letter. -Localzuk(talk) 15:10, 2 November 2020 (UTC)

UK insurance money
Uudiruritiir 91.110.121.104 (talk) 21:42, 21 February 2023 (UTC)