Thank you for all these suggestions. Women4Women & the Centre for Women's Justice sound terrific. I'm an ex-pat so still feel the UK is my home turf [spelling?].
In the US there's a very pro-SJ phone company called Credo Mobile. Unfortunately they don't have a plan DH and I can use but they walk the walk as well as talking the talk as they give a percentage of profits to good causes every month, and I've donated to causes they support. They also allow people who are on their mailing list to choose 1 one of 3 (though you can split your vote).
This month the third option is 'Women's March', described like this in the email:
'Women's March is the feminist organization that women in the U.S. have told us they need: bold, responsive, flexible, growing; an organization that foregrounds the leadership of women of color, while welcoming everyone who aligns with our values.'
All well and good. But then I had a look at their Mission Statement which included this paragraph:
'We believe that Women’s Rights are Human Rights and Human Rights are Women’s Rights. We must create a society in which women - including Black women, Indigenous women, poor women, immigrant women, disabled women, Jewish women, Muslim women, Latinx women, Asian and Pacific Islander women, lesbian, bi, queer, and trans women - are free and able to care for and nurture their families, however they are formed, in safe and healthy environments free from structural impediments.'
So another one bites the dust. I'll be voting for one of the other two. Probably Democracy For America.