The UK does not have a general retirement visa, so retirees usually need another route, such as a family visa, work visa or the strict Adult Dependent Relative route. A visitor visa is not suitable for living in the UK long term. Depending on the visa, you may need to show funds, pay visa fees and the immigration health surcharge before accessing NHS services; check the latest rules on GOV.UK. You should also investigate UK tax, pension payments, healthcare cover and any effect on benefits, ideally with regulated immigration and financial professionals.