TFSRM
One thing I can't understand, why can't they have two questions on the census? One for sex and one for gi.
As ChazsBrilliantAttitude says, there are two questions on the Census already.
Now, the thing that's harder to understand. The trans lobbying groups are against this. They don't want an accurate question on sex and an additional question on gender.
They want people to be able to put their self-identified gender for both questions.
They are not trying to ensure trans people are fairly counted. They are trying to get rid of sex as a meaningful category. And the ONS should really not be pandering to this.