If the government aren’t interested in providing guidance, there are others who can. It is, after all, the law. All you need to know about workplace toilets, from Sex Matters:
The Supreme Court judgment therefore means that all employers need to make clear in their policies that whenever a space is marked as being for one sex or the other, it is not for use by members of the opposite sex, regardless of claimed identity, certification or lifestyle.
The widely promoted idea that people may choose the facilities that suit their gender identity, or that they feel comfortable with, is legally wrong. Facilities are either for one sex only or for both sexes, with no exceptions. There can be no excuse for an employer to let people use the facilities marked for the other sex. This deprives everyone else of the single-sex provision they are entitled to under workplace regulations.
The signs on the doors of workplace toilets and other facilities are health and safety signs. They should no more be ignored than signs that say not to block the fire exit or warnings about hazardous materials.
Mick Hartley 
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