and let's not forget, the reason for removal is in case of a potential problem, not to deal with an actual health issue.
I think thats a very god point
If someone presented do the doctor with a suspected ruptured implant, I'd expect it to be treated immediately on the NHS without argument whoever put it in.
if they presented worried about the fact that they had an privately funded implant, and there was a (maybe) 5% risk that it might possibly rupture in the future, and they wanted it removed because they were worried about it, I don't think that should be the NHS's problem.