Indeed I mean National Insurance number.
I am a director of a UK limited company and not resident in the UK. Actually I travel between the UK and Belgium and have utility bill in the UK.
I registered for the PAYE employer and was asked a National Insurance Number.
Basically, my question is could I use my tax number from Belgium, knowing that I will have to pay taxes in the UK
Thanks for your answer. I had a NHS number when I was a student in London. Do you know if this mean that I had a one point a NI number and that I could still be valid.