Is this the Pathways Trial that came out of the Cass report?
If so my understanding is that it can only be used from age 11 or 12 ... by which time the boat will have sailed for many children.
I looked up what other countries do. Scandinavia seems to be strictest with psychological support being the first line treatment, with other European countries only allowing under very strict conditions.
It would seem that this madness is global.
I speak as GM to a transgender GC who decided they wanted to change their gender as soon as their periods began.
The only treatment that was given wss the pill to stop their periods till they were old enough to decide for themselves and they now buy testosterone privately from their savings. It breaks my heart to see them ... as they really do look weird sadly, but at least they were not assaulted with drugs as a child.