This bit right here. It's already being used this way as evidenced by the EHRC. And rather than delivering clarity, the UKSC decision has caused chaos because now we have orgs wondering if they can or must bar trans people from facilities. Seemingly for now it's a choice, yet many are taking it.
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It's already happening, and she's cis.
https://www.transvitae.com/cis-woman-accused-of-being-a-man-in-london-toilet-incident/