Right to recognition before the law - as in the right to recognition in their professed sex? As in a GRC? That exists. A significant process is currently required to get one in the UK, just like it is required for marriage, a passport, a driving licence.... Given what a GRC means, it seems remarkably cheap and easy to get one.
I am quite an extremist in this area and don't think the GRC should exist, as I regard gender identity as essentially a nonexistent 'thing' that shouldn't have legal recognition, and biological sex is unchangeable. But I acknowledge that I am an extremist, that this is the current law and I have no problem with that, nor would I prevent anyone from trying to get one, obviously. I will fight very hard to prevent the GRA from being 'reformed' so that there is no process involved in asserting that you are now a different sex. Luckily now that problems have emerged in Canada and are emerging in Ireland with reduced GR processes, this seems less likely to happen.