Wherever you look in the legislation, it works to lower the point at which the police can intervene. The old legislation, for instance, said they could do so to prevent “disorder, damage, disruption or intimidation”. That old formulation remains, but the Home Office has added a new criteria: “impact”.
Look closely at those words. The ones in the old legislation were all negative. But the new one is entirely neutral. Legally, it seems very broad. But if you look closer it is actually quite specific. It aims its sights at the entire purpose of protest.
The point of a demonstration is to be heard, to make an argument, to encourage others – whether they are people passing by, or workers in a company, or MPs in parliament – to hear the protestors’ point of view. In other words, to have an “impact”. This is why we call them ‘demonstrations’. It is a demonstration of a political view, expressed so that it can convince others. That is what makes it a vital part of free speech.