"The requirements for naturalisation as a British citizen depend on whether or not one is the spouse or civil partner of a British citizen.
For those married to or in a civil partnership with a British citizen, the applicant must:
* Have held indefinite leave to remain in the UK (or an "equivalent" (for this purpose) such as the right of abode, Irish citizenship, or permanent residency as a citizen of an EU/EEA country or a family member of one) at the time they apply for naturalisation. As of 12 November 2015, EEA nationals are explicitly required to obtain a proof of permanent residency in the UK (in the form of permanent residency certificate) if they are to become a British citizen by naturalisation. Proof of permanent residence is obtained by completing form EEA (PR) for Home Office approval.
* Have lived legally in the UK for three years
* Be of "good character", as deemed by the Home Office (in practice the Home Office carries out checks with the police and with other Government departments)
* Show sufficient knowledge of life in the UK, either by passing the Life in the United Kingdom test or by attending combined English language and citizenship classes. Proof of this must be supplied with one's application for naturalisation. Exemption from this and the language requirement (see below) is normally granted for those aged 65 or over, and may be granted to those aged between 60 and 65. (...)
* Meet specified English, Welsh or Scottish Gaelic language competence standards. Those who pass the Life in the UK test are deemed to meet English language requirements."