Britain is a shit hole, it is becoming a chav infested pit, with the majority having no respect for anyone nevermind the police.
Much as I agree with some of that sentiment, there are plenty of countries with armed police with similar or much worse social problems.
In the situation above I think mace/pepper spray might have been effective. But IANAP.
can I just ask, if the bobby in the video had struck one of the people trying to get in, what do you think would have happened?
Looks like he swings at a couple of them.
Conversely if the lone copper had drawn a gun whilst swarmed with people, how long before someone makes a grab for it resulting in either an accidental discharge or a zooming chav with a gun?