Healthcare is a bottomless pit. Demand is effectively infinite so no amount of funding will ever be enough. That's not to say we should eliminate it, but there has to be a balance. We shouldn't dump so many resources into healthcare that it strangles other sectors like space launch that are pushing human society forward for the long term. Whether that enriches certain individuals or not is completely irrelevant.

And you present a false choice. No matter what it does, the NHS can only ever have a relatively minor impact on the health of UK citizens. In terms of lifespan — and more importantly healthspan — it's less significant than lifestyle factors: exercise, diet, substance abuse, sleep hygiene, violence, toxin exposure, etc.