speaking from my own personal experience, thank you for your comment! I would rather pay for care in Thai hospitals. I'm not discounting the many great medical staff that work for them, just overall the NHS service is not great. Long waiting lists/time to see GPs, not to mention the dreadful dentistry.
not possible at the moment, if you did that I suspect you would be subject to quarantine requirements unless you make the trip by air and are double vaccinated. Border bounces will become a thing of the past.