Even if they got to appeal the Trust would run into the basic problem of proving that the legislation which provided for single sex changing areas was passed on the basis that the word woman was used to mean females and some male persons.
The SC has already ruled on word woman in the EA.
Changing rooms are health and safety obligations pulling health and safety legislation apart to change the meaning of the word woman is a poor use of public funds with imo a very low change of the SC ruling it included some males.
Eg the 1992 regs schedule 1 takes account of the biology in toilets with male (not man) provision and female provision (not woman)