I worked and paid in to the UK system for many years, but have then been working in finance in the Republic of Ireland for 5 years and paid tax only there. I retained a UK address but was not resident in the UK for this period. I am contemplating a return, partly with a view to being able to access the NHS if required in future, partly for personal reasons. I don't have preexisting conditions. I'd hope that if I returned, got a job and paid tax in the UK, I'd rain NHS eligibility. However a scenario could arise where I was 183 days. plus in the UK, but the bulk of my income and my tax payments happened in the Republic of Ireland. I am not quite clear then whether I'd still be NHS eligible. I'm not trying to game any system, just see what the actual law is. Thanks