Boiler,
The US version (SSN) is also not a national identity number. The SSN is given out to, and asked of, many people who are not US nationals, not even US LPRs. It may be used as a defacto ID number for people who are in the USA and are (legitimately) working, paying taxes, and other activities, but such uses are not a national identity number.
Yodrak
QUOTE(Boiler @ May 24 2006, 04:47 PM)

UK National Insurance Number would be obtained by anybody with leave to remain.
Not quite the same as the US version as it has not been hijacked to become a national identity number, I would have to look mine up, I think I put it down as my Identity number, last time I had used it was 15 years before so took a bit of finding. From memory the only time I have needed it was in changing jobs and surgeries.