On how UK women can help:
Definitely donate to the networks that are springing up to help women and girls in need. Beyond that, I'm not sure there's much you can do. The US needs to go through a real reckoning (again) with widespread misogyny.
Oh, except I will add that it would be great if while American feminists are fighting misogyny on two major fronts, the minority of you who engage in it currently could try to hold back sometimes on friendly fire of the "fuck them" variety.
As a US feminist, a woman of childbearing age, and a mother of daughters, I really appreciate all the actually supportive comments.
For US women:
I think we should take inspiration and tactics from our Irish sisters' recent victory on this front. They were very effective in persuading men, even men from conservative religious backgrounds, that not only was the right to choose a right, but that it was important and urgent. Many American men will say they are pro-choice, but so far have not lifted their littlest finger to guarantee that right in law for women and girls.