Videos like this merely confirm what I’ve witnessed myself, on a number of occasions.
It’s common practise to use agents provocateurs. That such things are now being caught on film just means that the credibility of the police in such situations is eroded even further. There’s no justification for such actions whatsoever.
What it means, is that if the police are known to use illegal tactics to suit their own ends, then the use of violence against the police is no longer an act against society, but the right of free citizens against the illegal actions of the police.
I for one will not have any sympathy against the police if they choose to act in such a manner next week. In fact, if they choose to break the law against British citizens exercising their democratic right to protest, then I hope they get a good pasting.