If you want to apply for an NI number to start work or make voluntary contributions - Telephone 0845 600 0643 (8.00 am to 6.00 pm Monday to Friday). Jobcentre Plus will check to make sure:
* that you need a NI number
* you don’t already have a NI number
Where you don’t have a number but do need one Jobcentre Plus will arrange an Evidence of Identity (EOI) interview for you. Jobcentre Plus will confirm the date, time and location of the interview and will tell you what information/documentation to bring with you.
http://www.direct.gov.uk/en/MoneyTax...ts/DG_10014073