Ok, I think the issue must be a misunderstanding of how the UK health system works, then. The NHS definitely won't fund all medical procedures just because they're legal, and whether or not it is publicly funded / guaranteed is still moot at this stage – that decision will happen entirely separately.

What you're saying is equivalent to "botox shouldn't be publicly funded, therefore it shouldn't be made legal". Botox is legal in the UK, of course, but you definitely won't be able to get it on the NHS, so your "therefore" doesn't follow.