This must be one proud Brit!
Brit is a short form of British person, I reckon.
And well “N1” probably means Number 1.
So.. Number 1 British person.. That’s a heavy title to proclaim my friend.
Regardless of your accomplishments in life, which may or may not land you that self-proclaimed title, at least your custom vanity licence plate ended up on FunkyPlates.com.