A reminder that JKR has no political power whatsoever, and if she had the soft power claimed, Brexit wouldn't have happened and Labour would be in Government.
If the Uk Government 'backed out' from the proposed self identification bill as a result of JKR being 'a big reason why', it's because she pointed out what the proposed law was intending to do, and what was wrong with it.
Pink news called her a fucking liar TERF liar bitch TERF, and then had to officially retract that, because JKR had correctly stated what the law was going to mean, and her criticism of it was indeed merited.
Also note that the Uk government has at no time 'backed out of trans protections'; they killed a proposed self-identity bill at early draft. Trans citizens have all the same rights as every other citizen, under the same human rights legislations as other citizens. They actually have slightly more if you really want to get pedantic about it, although not to the extent that Stonewalls diversity service claimed they did (leaving subscribers to that service and adherents to their advice open to wrongful dismissal lawsuits).