I found this amazing memo to the Human Rights Joint Committee from an ex police officer (inferred from his comment on his training of how to use a wooden truncheon).
http://www.publications.parliament.uk/pa/jt200809/jtselect/jtrights/47/47we12.htm August 2008.
This memo should be wheeled out here when people defend the actions of the UK police to the point of hysterical cognitive dissonance. Its not a few bad apples, its the whole structure, their training and collective approach.