The consultation is actually about diversity, in particular women and those from ethnic minority backgrounds. They are proposing comply or explain targets for both. Ethnicity is not "legally defined". It's just a commonly used term, as is gender. Do you think ethnicity needs to be legally defined KevinBacon, prior to being recorded? It a bit late for that as we already do record it.
If this regulation (listing rules) is agreed then are you still going to protest its not legal/GDPR etc to use the words we use?
It's already legal for employees and board members to change their id from male to female so what exactly are the sex discrimination claims you are referring to?
Non binary identity is irrelevant for equal pay claims and if someone's ID is female then they are female for pay comparator purposes.
Can you be more specific about the sex discrimination claims you can see in this consultation document?