This is EXACTLY what it is. I hate it that it's somehow become a "feminist" issue when it's women doing this to girls.
Either way, good move by the UK, other countries should do the same. Thing is, how will they know? It's one thing that a girl speaks up about it, but what about those who won't?
On the other hand, no it's not like male circumcision breh. Both are indeed a mutilation (I agree with you on that part) but FGM is much more invasive and its effects are much worse, from what I've read about it.
Just because women are the culprits doesn't mean It's not a feminist issue.