@Toon
@jonathonkennard
I hope this post doesn't sound overly pedantic, especially as I don't know all the UK rules on residency and NHS access. But once you've moved abroad this potentially impacts your entitlement to such access. Although it's clear that you can (and many do) continue to do so... often thinking that it's totally OK. However, this area is a big deal for the NHS and they look for NHS Patient Fraud (using NHS in the UK, when not entitled to do so) and NHS Overseas Patient Fraud (accessing the NHS within the EU using an EHIC/GHIC). A lot of us probably assume the former category is about naughty foreigners rocking up in the UK to sneakily get major surgery, but it can also apply to Brits who've relocated abroad, and now want to pop home for a new hip.
https://cfa.nhs.uk/fraud-prevention/ref … S-patients
@jonathonkennard
If you relocate to Cyprus, then you typically need GESY or a private health policy. And you lose your rights to NHS access because of non-residence. But you'd need to check the exact rules, especially if you still keep a home in the UK and spend some time there. I've been outside the UK for many years, and it would be definitely a bit naughty of me to pop back and try to get free NHS treatment (but I'd probably get away with it as I have a UK passport and a UK address with up-to-date proof). I think I read the rule is "ordinarily resident" which is a slippery concept: if I had a major emergency and I need a new ticker, and I wanted to do it back in Suffolk... I believe I can return to the UK with the INTENT of living there (i.e. leaving my current home abroad), and that would (immediately) fit the bill, and my NHS use would therefore be OK. :-)
@Toon
Those with rights under the Withdrawal Agreement (including me, and you, I think) can get an UK EHIC still. Others can get a GHIC. Both are for accident/emergency cover while travelling in the EU.
However, as above, if someone (e.g. me) has been living abroad, and no longer resident in the UK, then it's not clear that one can continue to use the GHIC. (I'm assuming the UK EHIC is OK, as that's issued on the basis that you're resident abroad in an EU country, pre-Brexit.)
I could easily request a new GHIC in the UK, and I'd guess I'd probably get away with using it. But, strictly speaking, I should be using my BG EHIC as that's where I (mostly) live and where I'm paying my social security contributions. Similarly, someone living in Cyprus would, ideally, have a CY EHIC for their EU travel. Understandably, the complications of GESY make getting a CY EHIC much harder (if not impossible for some years), hence the very natural temptation to keep using one's GHIC.