There's a strong case for nationally-agreed guidance here, produced by government, which has been thoroughly tested on its own lawyers. Some of what NHS Lanarkshire has signed off and is trying to defend is indefensible, for what it requires of women staff. https://twitter.com/scotonsunday/status/1294918406827921409
Parts of the NHS Lanarkshie policy fit with what @euanmccolm argues here, that unreasonable demands made on women are damaging to what could be a better discussion. https://twitter.com/mbmpolicy/status/1294944383368822784?s=20
On the schools side, advocacy groups were left to promulgate guidance which has now spent 18 months in a state where government accepts it is legally inadequate, but it has been neither withdrawn nor replaced. This messy situation is bad for everyone. https://twitter.com/chloeklassen/status/1294597640974479360?s=20
Leaving aside the likely illegality, would any political party actually put in its manifesto that NHS staff women's changing rooms should be open to use by male staff who cross-dress for "erotic pleasure" (this is a direct quote from the NHS Lanarkshire)?/
Would a party be willing to put in a manifesto that girls at school who don't want to share a changing room with a physically male pupil, however they identify, should be made to use the disabled facilities or wait until that child has finished changing?/
The basic democratic proposition is that parties should be willing to put these specific things in black & white and argue for them, if that is what they think is right, and not look to the introduction of policies like this thro local documents or third sector promoted documents
In the 2021 SP manifestos, any parties advocating for identity to over-ride sex in most/all contexts need to move beyond general references to "international best practice", and generic slogans, and spell out what practical policies they see flowing (and not flowing) from this.
Footnote: this is an interesting and relevant read to the cases above. h/t @MForstater https://a-question-of-consent.net/2020/08/16/croft-v-royal-mail-between-a-rock-and-a-hard-place/