if you're cis and you are asked by your management to police bathrooms, "can you confirm in writing that you are ordering me to approach customers to discuss their sex?" is an email no manager wants to reply to
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For business owners, the important part of the new ECHR advice is this:
13.179: There is no type of official record or document in the UK which provides reliable evidence of sex. [...] Therefore, it is unlikely to be proportionate or practical to ask for further evidence of a person’s sex.