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In order to apply for naturalisation a person be free from immigration time restrictions. In the case of a person here on a spouse visa this is called Indefinite Leave to Remain. For EEA member state nationals this is called Permanent Residence. Having EEA rights without PR does not entitle EEA nationals to permanently reside in the UK, it just entitles them to remain here whilst exercising EEA rights (ie. working).
He must complete 5 years in the UK on his current residence card, then he can apply for confirmation of his permanent residence:
Only once he has received his confirmation of permanent residence can he apply for naturalisation. This is a legal requirement and cannot be avoided. The eligibility criteria is here for persons married to UK spouses and please pay attention to the residence requirements:
Once he has received his certificate of naturalisation he can apply for a UK passport .
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