There is nothing precise to that effect on the guidance, though I guess if you married someone who lives abroad it may cast doubts on your future intentions to live in the UK.
https://assets.publishing.service.gov.u ... r+2025.pdf
If you are applying under the 5-year route (section 6(1)), you will need to confirm that,
should your naturalisation application be successful, you intend to continue living in the
UK.
If you meet the absence requirements set out above, this will usually be sufficient to
demonstrate that the UK will be your principal residence, as long as there is no information
that casts doubt on your intention, such as:
• a partner who is living, or who intends to live, outside the UK
• a recent absent absence from the UK for a period of 6 months or more
This does not necessarily mean your application will be refused but you may need to
provide additional information to support your application.
and in the caseworker guidance
Principal home in the UK
If applicants say their intention is to have their principal home in the UK, you should
accept that they meet the requirement if they:
• meet the residence requirements, without the need to exercise any discretion
over excess absences other than up to 30 days
• have an established home here
• have been, or intend to be, absent from the UK for not more than 6 months
• the absence was, or will be, clearly temporary
• if it is an intended absence, we are satisfied they intend to return to the UK
• they have maintained an established home here where any close family who
have not accompanied them abroad have continued to live
• there is no information to cast doubt on their intention, for example, either:
o a partner who is or intends to live outside of the UK
o a recent absence from the UK for a period of 6 months or more
Where it is proposed to exercise discretion to waive excess absences, you must be
satisfied that the applicant has an established residence, family and a substantial
proportion of any estate here. You should normally accept that situation will continue,
and that the future intentions requirement has therefore been met, unless you have
information that, since the date of the application, the applicant or their partner no
longer has an established residence here or is planning to move abroad.
Where it is not certain that a residence has been established you must make
enquiries to see whether there is evidence of a principal residence outside this
country including whether the:
• applicant or their partner owns property abroad
• applicant's family live abroad, either in the family home or elsewhere
Where there is such evidence, or your doubts cannot be resolved satisfactorily, you
must refuse the application.
Information may also come to our attention that HMRC regard an applicant as
domiciled abroad for tax purposes. In such cases, you must request the applicant's
permission to contact the HMRC. You should then ask the HMRC to provide us with
a copy of the applicant's completed ‘Domicile Enquiry’ questionnaire, which may
throw some light on future intentions. If the applicant refuses permission, you must
refuse the application.
The fact that an applicant's spouse or partner is not applying for citizenship should
not, of itself, be taken as evidence that the requirement is not met. In such a case,
however, you should make enquiries of the applicant - whether the spouse or partner
is resident abroad or whether there is any evidence that the spouse or partner
intends to move abroad. The fact that a spouse or partner is living, or will shortly be
living, abroad should not normally be taken as evidence that the requirement is not
met if any of the following apply:
• the couple are separated
• the spouse or partner has applied for, and is awaiting, an entry clearance
• you are otherwise satisfied that the spouse or partner intends to join the
applicant here
• it is clear the couple are content to live apart for the foreseeable future
If none of these reasons apply, and the information suggests that any applicant
maintains, or intends shortly to maintain, their principal residence abroad, spends
substantial periods with their spouse or partner and children abroad, the application
should normally be refused.
so if your partner lives abroad I would want to make sure that is clarified in your application (especially if they own property). They can probably become aware if you get married to someone who lives abroad while the application is in process, and though this is not explicitly mentioned and it seems a bit intrusive, I would make them aware to avoid issues.
All advice comes from personal research and experience and should not be regarded as professional opinion.
