And the fun begins:
https://www.bbc.co.uk/news/uk-56338666
Campaign group Fair Play for Women argued it unlawfully allowed "self-identification" as male or female.
The Office for National Statistics said it was asking the same question on sex it had done since 1801.
While I'm not sure about the aims of that campaign group on this matter I am pretty sure the 1801 census didn't ask if you identified as hetrosexual, homosexual, LGBTQ, (or an alien from the planet Zog).