Regarding the previous legislation which led to the wrongful arrest of protestors, a number of human rights organisations issued warnings about it before it was passed.

For example:

> UN High Commissioner for Human Rights, Volker Türk, called the Public Order Bill “deeply troubling legislation”, after it completed its passage through parliament on Wednesday.

https://news.un.org/en/story/2023/04/1136107

In fact, the UK category of the UN news feed makes for pretty embarassing reading in general, speaking as a Brit:

https://news.un.org/en/tags/united-kingdom