https://goodlawproject.org/resource/faqs-trans-inclusion-after-the-high-court-decision-on-the-ehrcs-interim-guidance/
from this doc:
Is it lawful for service providers to allow, for example, trans women to use women’s toilets and changing rooms (and vice versa for trans men)?
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Yes. The High Court is very clear that it will likely be lawful for service providers to allow trans people to use toilet and changing room facilities which align with their lived gender. There is no requirement of a ‘bathroom ban’.
The High Court concluded, at [26] (emphasis added):
“The [Interim Update] concerned when it would be permissible for a service provider to make a single-sex provision. It does not exclude or prohibit other provision.”
Later in the same doc:
What are the requirements for the provision of toilets, washing, and changing rooms in the workplace?
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Workplaces are required to provide toilet, washing, and changing facilities on a single-sex basis except where these are provided in individual rooms which are lockable from the inside.
Single-sex toilet, washing, and changing facilities in the workplace must be provided on the basis of ‘biological sex’. It is not permissible for employers to allow, for example, trans women to use the women’s toilets, and for those toilets to be considered single-sex for the purpose of the workplace regulations.
The High Court is clear that this does not prohibit providing additional provision which is not single-sex, at [26]:
Er.....................??