I think Debbie H. advocates for a third space, but regardless she already has the legal right to use female toilets and has had since 2010. Under current laws, trans people have a default right to use whichever single-sex area they choose, but can be turned away if doing so can be justified as proportionate.
I think rather than focusing on trying to roll back existing legislature ,which in the current climate seems unrealistic, we need to prevent further erosion of sex based rights, conflation of sex and gender and blurring of the sex binary.
I don't personally feel threatened by trans women in public spaces, but no my consent and boundaries do not overide anybody elses. That particular boundary of public facilities no longer exists though.
I guess I don't have a hard line on post op transexuals at all, I think they are utterly caught in the crossfire and if they have surgically removed their male genitalia, fashioned themselves the primary sex characteristics of a woman, and legally changed their gender via a GRC after rigourous medical and psychological assessment as far as I am concerned they are no longer male bodied. Not a man. That doesn't make a trans woman the same as a biological woman, but no sexual threat and to all intents and purposes a woman.
I am quite hardline about self id/GRC/any sort of legal recognition without medical and psychological assessment. I think participation in competative sports is a no brainer, is cheating and should be outright banned but my main concern is about the ideological shift away from liberal values of free speech and debate ,the bullying, intimidating and silencing tactics of the Social Justice Movement, the stifling of academia and scientific research, the reach and influence of Stonewall on companies, non govermental public organisations and the ex post facto changes to policy happening everywhere under the guise of inclusivity. All of which Debbie is helping with.
Awesome that I can disagree with out being silenced, shamed or physically assaulted though.