A riot would have to actually be violent. Shutting things down (with the exception of roads and emergency services) without hurting anyone or causing property damage is not violent, and most protests these days (at least those that don't cross the line into rioting) don't even bother shutting things down, they just hold signs, march from point A to point B, chant a few slogans, etc.
The Michigan lockdown protests were protests. Some of the BLM protests were protests. Even if they were inconvenient to a few things, nobody got hurt and nothing was destroyed.
Antifa leveling cities and Qtards invading the capital is rioting. Shifting the goal posts on what is and isn't acceptable is nothing but authoritarian, and if you want whatever peaceful movements are left in society to resort to violent action, an outright legislative ban on peaceful protests is the way to do it.
That being said, airstrip one the U.K. is already too far gone, so I don't think it'll matter. Ya got a loicense for that protest?
No, that's a riot.
A protest is to show a large number of people who disagree with some policy and that they feel strongly enough about it to show up all at once in one location.
What you've describe is not "peaceful assembly" and should not be allowed to happen, should not be treated as legitimate in any way.