Fair Play for Women (who are bringing the legal challenge) posted this update to their Crowdfunder on 2nd March. The crowdfunder is now closed because it reached its stretch target 
COURT DAY SET FOR 9th MARCH
GOOD NEWS: Today we have received an order from the Court listing our case for next Tuesday (9 March). We will be arguing for interim relief from the Court such that the ONS is ordered to immediately take down the Guidance pending judicial review.

In that same hearing we will also be asking for permission to proceed to Judicial Review to declare the Guidance unlawful.
Our primary and most urgent objective is make sure the Census runs without guidance that conflates sex and gender identity. This means the Guidance could be gone this time next week. Just 12 days before Census Day on 21 March
Our team has worked at incredible speed to get into Court before Census Day. Its a relief to know we've now secured the date! Thank you for the amazing support that's made it possible to get the best legal team for the task
We now have just 24 hours left until our crowdfunder ends. We are tantalisingly close to our target of £90,000!
Legal proceedings are highly unpredictable. There is still a lot to do in a short time. We'd go into next week with more confidence if we could reach £95,000
If we do exceed £90,000 then we will ring fence anything above that amount to be used for any future legal action, on this matter or other aspects of our work
Thank you for your faith in us. One last push to get us home and dry!
My best wishes and thanks,
Nicola