https://www.thetimes.com/uk/crime/article/police-make-30-arr...
Anybody can run their mouths. Discussing ideas with others is what’s protected.
For instance, in the US, I cannot hysterically scream FIRE while running toward the exit of a theater, nor could I express a desire to cause bodily harm to an individual.
Not that I would, per se, but if I did I'd be liable to prosecution for the damages caused in either instance.
I'd have to get the approval of those involved (by their not seeking legal recourse), in order to do either without consequence.
Obviously we should censor fascists and subversives!