Fwiw, and you will have to do the search engine/source reading on your own, but it's come up a few times and I think the reason British transphobia takes on that particular character is that its normalization as grown out of a cracker reactionary stalking-horse movement called "rational skepticism" that was united around the writings of guys like Rich Dawkins to do totally "progressive/liberal" Islamophobia and shit. That's where the TERFs met "libertarians" who'd grow into the fash.