Hmm true, there is the ECHR. But it is implemented into british law in such a way that there's nothing stopping laws being passed which are incompatible with it. Whereas with the US and other constitutions you have judicial review.
That's just because the R's expressly don't care about constitutionality. If the UK had a written constitution, both parties are still at a level of integrity where they'd want to (at least appear to) be keeping it, so a judicial challenge to these terrorist acts might have actually struck them down.
The Suffragettes are certainly a good counter-example. I didn't mean that people haven't been protesting, just that I can't remember any recent protests (apart from strikes which are something different) where the government gave in and made concessions.
Btw: does anyone know if they've invented a way of guaranteeing (not) AI yet? It's getting harder and I can see this becoming a pressing issue, especially in journalism.
Take your pick