I'm not 100% convinced that the guidance has been changed and put into place across all police forces or if it's being urgently looked at. Then there's the devolved powers; Scotland, Wales and NI.
https://www.telegraph.co.uk/news/2024/02/28/transgender-police-strip-search-same-biological-sex/
https://archive.ph/sKVDq
Use the archive link to jump the paywall.