Maybe it's time to take the fight to the HSE. If WR1992 are based on the social construct of moral propriety, then how is it meeting the needs of the up to 80% of British people whose sense of moral propriety is offended by having to share toilet facilities with certain members of the opposite sex who demand it?
And, claimants need to put in much more evidence. The SC were able to infer logically that the PMoAaLA underpinning Schedule 3 must be sex-based (because the solution had to work for people who are identical except for possession of a certificate) but never had to say what it actually is. Time to address that question.
Personally, I think that 'because we all want it' ought to be enough. But sex-based evidence is going to be more powerful.
Why separate provision is better for both sexes (safety data, crime stats, toilet design)
Survey evidence - how many avoid toilets based on signage? How many are made distressed and anxious by the signage or by the risk or actuality of encountering the opposite sex in there?
Also, especially for this Judge, some scientific papers on human ability to discern sex! And the % of TW that don't have genital surgery or a GRC. And survey evidence on how many people think TWANW. Because she acknowledges they exist but doesn't think their needs have to be met (they must be on the WSOH or something).