writetothem.com
i know you won't do this without a script so here's a couple of suggestions to include in your email:
Dear [Name],
I'm writing to you about the recent Supreme Court Ruling which declares that trans women do not meet the legal definition of woman, and that "woman" is legally a "biological woman", but which does not explain what "biological woman" entails.
As a [cis woman, this ruling leaves me less safe, emboldens violent bigots to potentially assault me because of physical features which do not meet their definition of womanhood, and places my transgender friends/family at even higher risk]/ [cis man, this ruling leaves my female friends both cis and trans less safe than they were previously]/ [trans person, this now leaves me at risk of assault every time I attempt to partake in normal public life such as shopping, eating in a restaurant, or going to work].
It is not based in science, and it is noteworthy to me that no transgender people were allowed to give evidence in support of their own legal identities. It aligns the UK not with the forerunners in human rights but with regressive regimes which our Governments, past and present, have rightfully denounced.
I am writing to you today to say that this ruling is politically motivated, prejudiced, and liable to fall in the European Court of Human Rights where it is almost certainly to be taken next, and to ask you to consider refusing to support any further attempts to exclude trans women from public life and basic human rights.
Regards
[NAME]