Newspapers will be exempt (section 180 of the same Act I think).
The rest of your post is merely a rehash of your two tier policing argument for which you are basically rehashing right wing propaganda which is deliberately trying to build a perception of two tier policing. Every situation will be policed differently determined by a number of factors, it is very easy (and convenient for malign actors) to present that as evidence of two tier policing.
There were 135 arrests in relation to BLM protests, but authorities also found that the main organising groups of these protests did not incite disorder or violence. As reported at the time (
https://www.independent.co.uk/news/...rge-floyd-police-statue-arrests-a9567496.html)
The State (the Government) does control the law, they literally write it. The courts apply the law and, often, have to interpret the law. If the State does not like the interpretation of the law, they can rewrite it, this is how it has been ever since the State existed.