Thanks for your question.
If you wish to apply for UK citizenship you must first applying for indefinite leave to remain in the UK, you can then apply for naturalisation as a UK citizen 12 months after that provided you meet the criteria on the following page:-
In order to apply for indefinite leave to remain you must have remained continuously in the UK on your ancestry visa. This is generally taken to mean that you must not have spent more than 90 days outisde the UK in any 12 month period.
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