Today's report by @Commonswomequ on the economic impact of Covid-19 on women makes the following recommendation about the need to collect sex-disaggregated data: https://publications.parliament.uk/pa/cm5801/cmselect/cmwomeq/385/385.pdf
A certain irony to see that @ONS claim they are "committed to providing disaggregated data" when they have abandoned the principle of gathering robust, high quality data on sex for the 2021 census in England and Wales.
They intend to frame the sex question in the census as one about self-declared gender identity, despite the fact that there is a new, separate question on gender identity. You can read more about the hazards of this approach here: https://murrayblackburnmackenzie.org/2020/11/30/international-evidence-and-the-risks-of-reframing-the-sex-question-in-the-census/
A report I co-authored with @janeclarejones, published last October, demonstrated how - in developing the sex and gender identity questions for the census ONS and the National Records of Scotland - privileged the views of groups claiming to represent the trans community.
The report can be read here and just yesterday, hard copies were sent to all MPs, MSPs and AMs by @Womans_Place_UK who supported this project along with the University of Oxford, overseen by @selina_todd: https://www.history.ox.ac.uk/women-and-equalities-law-historical-perspectives-present-issues