According to UCU, the case has been comprehensively decided in favour of UCU:
https://www.ucu.org.uk/article/14047/Employment-Tribunal-rejects-claims-University-and-College-Union-discriminated-against-members-on-grounds-of-their-gender-critical-beliefs
However, I can't find anything confirming this; in particular, the judgement does not yet seem to be out at https://www.gov.uk/employment-tribunal-decisions unless I'm missing it.
Anyone know more? Disappointing, if so, though I think we did wonder about whether the legal basis (what exactly constitutes harrassment/discrimination from one's union?) would fly.