The codes of practice that provide detailed guidance on police powers can be found at https://www.gov.uk/guidance/police-and-criminal-evidence-act-1984-pace-c...

Ten years after the introduction of the Police and Criminal Evidence Act, the Home Office instigated a review of the impact of the legislation on police practice. A summary of the results of the review can be found at http://webarchive.nationalarchives.gov.uk/20110222095814/http://rds.home...

Perfect Storm: The England Riots Documentary http://www.youtube.com/watch?v=IMvuoGji3yU
This mini-documentary film looks at the initial causes and wider context surrounding the 2011 England riots.

10 Rules for Dealing with the Police http://documentaryaddict.com/10+Rules+for+Dealing+with+Police-8186-documentary.html
A US based docu-drama about how citizens should respond to encounters with the police