Some NHS trusts do cosmetic implants if the 'patient' can prove they need them for psychological reasons, that I have never agreed with, the same goes for sex change operations and IVF.
The NHS pays to heal existing health issues. Or to correct what it has messed up. It would be an act of charity to use our money to pay for correcting privately funded cosmetic surgery that is not presently causing ill health. It's not what the NHS is funded for. The only reason it might contemplate funding removals is if it could show it would save money in the long run.
Just to want a bigger bust is vanity and is done privatly I should think.But if the woman is in danger from leaking implants then the NHS can't just turn their back on them, I dont think anybody should be allowed to have them for purely cosmetic reasons after this problem.