"“What is your sex” question in Schedule 2 to the Census (England) Regulations 2020 means sex as recorded on a birth certificate or Gender Recognition Certificate."
This has been established only after a legal challenge crowdfunded in a very short time, after the Office of National Statistics provided incorrect guidance.
ONS to pay all costs.
fairplayforwomen.com/fair-play-for-women-wins-high-court-challenge-against-ons-census/
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BBC Radio 4Extra Scheduling Shake-Up.