This is both scary and ludicrous at the same time.

As Chair of Reading Community Radio, I am aware of the need to have parental permission before interviewing children who will be identified and of the need for our volunteers who will be coming into contact with children, young people and vulnerable adults to have Criminal Record Branch checks. This is for fairly close contact.
In this case however, we have a PUBLIC parade. What is the purpose of a public parade? To be seen!

During the parade there would be hundreds, if not thousands, of people with cameras, mobile phones and video cameras. Did the police remonstrate with all of them?

Full marks to the young lad for attempting to stand his ground and to ask reasonable questions, to which he did not receive answers. The use of one expletetive, apparently when being pushed downstairs, is excusable.

The words Police State come to mind.

Eddie