The capacity is not present for the services to be provided by medical staff only (the NHS is on its knees, removing the focus of meds to private aesthetics would result in a non operable system) Treatments costs will go up, legal supply will minimise – Demand will retain and maybe go up resulting in the black market trading inflating.
The market will still be purchasing the services in even more unsafe situations. Complications will increase and the NHS will end up with more complex cases.