I think this is good. It explains the law in exactly the way I and many, many women here have always understood it.
Decisions have to be thought through from all angles (and all protected characteristics), proportional, reasonable, based on biological sex, case by case for the service/ activity not the individual. Reasonable discrimination, vs unreasonable discrimination is allowed is support of a legitimate aim.
That gender is stereotypes and stereotypical presentations, but not to make assumptions where people look gender non-conforming because they may be breaking down stereotypes rather than being ‘trans’. ( I actually really like that bit 👍)
I think this also makes it clear that we can ask about a person’s sex where it is unclear or where we might suspect someone is trans.
I think we need to start differentiating in speech between justifiable discrimination and wrongful discrimination, not short cutting by saying ‘discrimination’ as if all discrimination (ie differentiation or application of judgement) is bad when clearly it is not.