Yes, medical tourism from countries with bad medical systems to other countries can be viable when service is much better or prices are more affordable.
More than that, the NHS, being a socialist entity, gave up on the patient. This is the crux of the reason socialist systems fail- they give up easy.
There is quite a thriving business for dental work across the US border in Tiujana. I know many folks who get dental work done much cheaper, and just as good, by dentists who set up shop in Mexico.
I'm sure there are bad dentists who do that, but many are good. I know several San Diego residents who go to Mexico for their dental work. Cheaper and just as good.