Domicile is a legal term - it means you "belong" to a certain country - often the place you regard as your homeland. Your country of domicile is normally the same as your nationality, irrespective of residency. If you want to become domiciled in the country you are living in, you would have to prove to the Inland Revenue that you no longer have material connections with the UK, and that you are a permanent resident.

Even visiting family once a year would likely mean a change in domicile would be challenged AND having a UK bank account is a definite no-no.