https://www.tuc.org.uk/research-analysis/reports/do-not-make-amendments-equality-act-current-definition-sex-letter-kemi
Why women union members continue to apy subs to unions thaat don't respect women and are member of the TUc I do not know..
If you are fed up with your own union the non-TUC, politically independent trades union AFfinity is an alternative for teachers, lecturers, bank staff, IT consultants, financial advisers, academics, local government staff, lawyers and civil servants and many others
https://workaffinity.co.uk/