You should only enter British if you hold a UK passport.
If you live in Britain but are not a UK national, here is the identification information we need, depending on your nationality:
- If you have multiple European nationalities, provide the first one when they are listed alphabetically
- If you have a mix of European and non-European nationalities, give priority to the European one
- If your nationality lists 'CONCAT', you don't need to provide us with anything!
Note: it does not matter if you have a national insurance number or pay taxes in the UK.