In this respect, the EHRC says, "a trans woman is a biological man" and "a trans man is a biological woman".
The guidance also states that "in some circumstances the law also allows trans women (biological men) not to be permitted to use the men's facilities, and trans men (biological women) not to be permitted to use the women's facilities".
When asked to clarify this, the EHRC pointed to a section of the Supreme Court ruling stating that trans men could be excluded from women's facilities "where reasonable objection is taken to their presence, for example because the gender reassignment process has given them a masculine appearance or attributes to which reasonable objection might be taken" in the context of a women-only service.