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I would hope that the guidance issued is restrictive, and clearly says that a "single sex" service is trans inclusive unless there is explicit notice posted that it is trans exclusive, which is acceptable in very limited circumstances.
Given that being trans (i.e. having the protected characteristic of gender reassignment) is v. wide criteria, this in practice means the service is mixed sex. So then it should be labelled mixed sex (which with floor-to-ceiling cubicles, as you say, is fine)
The point is there should be clear expectations for all - women should be able to be told clearly if a changing room, toilet, dorm, showers whatever is single sex or mixed.
Do you understand this? Visually, auditorily there is no way to distinguish between a male person with the protected characteristic of gender reassignment and one without (and it would be rude to try).
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