Feminist, gender-critical declarations have been published by most of the main parties. They look fairly similar to each other. (I don't think this is a coincidence). Looks like anyone can sign any or all of these - you needn't be a party member or supporter, but will they have any effect on the policies and practices of the wider parties?
This was covered in a Morning Star article yesterday. Links below:
Greens
Tories
Labour
Lib Dems
SNP