All he had to do was film it and submit it to the police. If they choose to do nothing that is up to them. If this guy wants to pretend to be a police officer, he should sign up and become one. There is obviously more to this story than he would like to admit. Like when the police asked him to move on and he still continued to be an arxe. He would have been arrested to prevent a breach of the peace and not for being a pedestrian. They would not want to be wasting their time and tieing their day up with a man like this.
No doubt in his spare time he goes and glues himself to roads with the other muppets.
It appears you didn’t bother reading the article, Steve.
The police could have easily charged the drivers who were disobeying the ‘no motor vehicles’ sign so they could drive through a pedestrian precinct illegally. Instead, they waved them through. That’s just completely backwards.
Lastly, and you really should know this, the police are the public and the public are the police, the police being only members of the public who are paid to give full-time attention to duties which are incumbent on every citizen in the interests of community welfare and existence.