Sorry only just had time to catch up on this thread from when I posted last night.
I dont want to repeat the whole post I made, but just to be clear, the SSE no longer apply or have any relevance.
This is because the Court judgement was if you use the word sex it is about biology.
The only hurdle now is not the SSE, but the SSS. ie you have to prove that a single sex service is a legitimate means of achieving your goals.
If you want to hold an event or sevice for women and for trans women the Court Judgement means it is no longe a SSS (single sex service).
So all this discussion is irrelevant.
But I did quickly see someone had talked about say only targetting a particulat age group. As over 50s clubs etc., are regularly advertised there must be in as in the SSS something about how it is a proportionate measure to achieve an aim.
And suspect that after the EHRC has re-written their guidelines they may have an example of how it is proporationate to achieve a particular aim so that an event of service is open to both women and TW. But as the law does not recognised self identity it may turn out to be the exact opposite of the now redundant SSE ie instead of a clause saying men with a GRC are not included, the new one might say only men with a GRC can be part of a women and trans women event, because the Protected Characteristic in Gender Resassignment (not gender identity).
If this happened I think TW will be really please and it might make it clearer assumng some service providers will wants this, that it is clearly advertises as Women and TW with a GRC.
(ie the EHRC cannot write guidelines based on Stonewall Law, but only on the Law as passed by Government and amended by a Court.)