I can across this article on the legality of body modifications.
^The Court of Appeal held that the judge was correct and, in these circumstances where serious injuries were caused, the consent of the clients did not mean that offences were not committed. The court considered whether the procedures that had been performed were analogous to tattooing and piercing and decided that the injuries caused by the removal of body parts and tongue splitting were far more serious than those incurred in the course of those lawful activities.
They also felt that there was no “good reason” to allow consent to absolve the appellant of liability. They stressed that the procedures posed a serious risk to health and were surgical in nature – yet they were performed for no good medical reason by an individual who was not medically trained.^
Surely surgical interventions to affirm a person's gender identity fall in this area of body modification, so how are they legal? Is the essential difference that they are performed by medically trained people?