Coincidentally, Akua Reindorf KC (one of the Commissioners of the EHCR) tweeted on this just now to somebody who had a similar question.
Question: My understanding is that it says, for example, that lesbian groups must exclude trans women? Rather than can just legally exclude them if they choose?
Reply from AR:
It’s an inevitable consequence of the judgment. In general an association mustn’t discriminate against a person by depriving them of membership because of a protected characteristic: s.101(1). So eg a reading group can’t say “no disabled people” /1
But there’s an exception which says that an association can be limited to people who share a protected characteristic: Sch 16 para 1. Thus an association can be limited to women, disabled people, older people, black people etc /2
An association can combine protected characteristics as long as it’s for people who all have the same two (or more) PCs: lesbian women, black men, young Asian disabled people etc. This way, everybody in the club falls within both/all the PCs /3
But you can’t have an either/or association: disabled people + older people; black women + white men; young people + disabled people. This is because the association can’t satisfy the single protected characteristic condition for any one of its PCs /4
So you can’t have an association for lesbian women and heterosexual men with the protected characteristic of gender reassignment (which is what trans women who are attracted to women are for the purposes of the Act) /5
This wouldn’t be an association for lesbians because it would have straight members; it wouldn’t be an assc for women because some members are men & it wouldn’t be an assc for trans people because some members aren’t trans. Hence it’s discriminatory and unlawful /end
https://x.com/akuareindorf/status/1916748422658359573