What I've not seen is any mission creep within those grassroots groups & women, slowly or quickly, descending into right wing religious zealots hellbent on usurping the aims women are fighting for into anti abortion or anti LGB people/rights.
While this may not be occurring in UK feminism, it most certainly is in US feminism. The group, Moms for Liberty, has some aims that left-leaning, grassroots feminists agree with: namely, porny graphic novels shouldn't be in children's library collections and that gender woo shouldn't be taught as facts in public schools.
Many women and men who are appalled by the creep of gender ideology and kinky sex education into school curriculum support Moms of Liberty into. However, the creep DID come into play as now Moms of Liberty suggests book banning that is far more overreaching, and includes innocuous books like a little Black girl learning to love her braids. These same groups are funded by anti-abortion groups, an issue which, IMO, is a greater threat in my own country.
So, if JCJ and the Brighton feminists fear this creep, there is evidence that it exists in other countries.