There was a comment by the initial close-voter; I can't remember it exactly, but it was to the effect of:
The UK and US are similar enough politically that the answer will be the same.
Unfortunately, they edited that comment into the auto-generated "Does this answer your question?" comment, which gets deleted once the question is closed, so you must not ...
It appears that the author's intention was to create a dupe-target for general questions about the powers of the British monarch.
This is a good intention. When there are question which sound slightly different but always receive the same answer, then creating a new question which covers them all, posting a good answer to it, and closing all the old ...
Regarding my VTD: your question consisted of two large quotes one from
'My son killed himself after circumcision' - BBC News (2019)
David Reimer - Wikipedia
And based on that you ask "Why hasn't the UK enacted a male version of Female Genital Mutilation Act 2003"?
Why would they enact an Act based on two cases, even if they are what you say ...