Check your National Insurance number
HMRC have announced a new procedure whereby individuals can email them for written confirmation of their National Insurance number using form CA5403.
'If you've lost or can't remember your National Insurance number or can't find it on official paperwork you can email HMRC for written confirmation of your number. You can also use this service to let HMRC know that you've changed your name or address.'
'National Insurance cards are no longer issued and your National Insurance number is not proof of your identity.'