Posted: Mon Nov 6, 2023 3:18pm
This is the guide if you move to Spain
https://www.gov.uk/guidance/healthcare-in-spain-including-the-balearic-and-canary-islands#getting-treatment-in-the-uk
Extracts:
If you are a UK national and move to the EU, you should not expect to be able to use NHS services for free when visiting the UK unless you have an EHIC, PRC or S2 to show your healthcare costs are funded by the EU country in which you now live, or another exemption applies.
I found the NHS phone number shown on the S1 webpage is very helpful if you have questions.
The bottom line is take out travel insurance from Spain, a good idea anyway, to cover any NHS costs when back in UK