- Change of your Employer does not cancel your National Insurance Number. It still must be in the system. And you can reference to your “old” NIN since it is not old at all - it is current :).
However, if you want to be self-employed (since our visa allows this option) - it is required to let the HMRC know about this.
- It may be required now. But the field must be optional.
NIN is a characteristic of people who are physically located in the UK. However, a significant number of applicants are outside the United Kingdom.
Additionally, please, read an answer to a very similar question that I got two years ago about NIN.