Living in a non-bilateral healthcare agreement country?
If you choose to go and live permanently (or for more than 3 months each year) in a country with which the UK does not have a bilateral health agreement, then you will not normally be eligible for free NHS hospital treatment during a visit to the UK, no matter how long you may have lived here in the past. You may, however, be exempt from charges if you meet one of the other exemption criteria, for example because you are working abroad and have been doing so for less than 5 years.