British citizens fulfil the nationality qualification for registration in respect of all elections in the UK.1
Marriage to a British citizen does not automatically mean someone becomes a British citizen. Being born in the UK does not automatically confer British citizenship either. If an applicant is unsure whether they are a British citizen, they should contact the Home Office to make sure that they meet the nationality qualification before applying.
Citizenship ceremonies
Citizenship ceremonies are the final stage of attaining British citizenship. However, an invitation to a citizenship ceremony is not in itself proof of citizenship.