I've said this before and I doubt it will be the last, but this ban is not about child safety. It's about reducing the number of trans kids because they're a political inconvenience to a slice of the establishment. If it was about how unsafe they are, it wouldn't only be for kids experiencing gender dysphoria/incongruence. The ban would extend to intersex adolescents:

However, [Streeting] overlooks the fact that this ban does not include teenage patients with a difference of sex development (DSD), more commonly known as intersex. These individuals are prescribed puberty-blocking medication when they unexpectedly commence a puberty that is at odds with their gender identity. DSD patients are taking the medication for much the same reason as transgender patients – ie the puberty they are undergoing is causing distress, and pressing pause will probably manage that distress and minimise harm while a continuing care plan is developed. If we follow Streeting’s logic, the medication would also be banned for this patient cohort.