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Once you have your British Citizen passport, you can live and work in the UK and the EU (before Brexit in 2019).
Are you planning to move to the UK? If so, you should go and apply for a National Insurance Number (NI number) as soon as you are in the UK.
How did you get your British Citizenship? You may not be able to pass on your British Citizenship to your children born outside of the UK.
If you register / naturalised (歸化) to become a British Citizen and do not have your registration / naturalisation certificate, you can apply for a replacement using the link below -