Further to Derek.S 's defence of the constabulary as above, I would like to recommend the following book;
http://www.mondaybooks.com/policetime/policetime.html
It is a great read and details the day to day business of a beat bobby. I beleive the book is written by himself under a pseudonym.
The bottom line is that if a copper nicks someone, he then gets buried under a stack of admin which can last most of his shift.
The answer if you are a copper, is to get out early,nick someone , then spend the rest of the day in the nice warm station, drinking tea whilst you process the miscreant.
Equally,if you feel drawn to felonious activity, your best bet would be to go out grafting in the late afternoon by which time,all the coppers will be in the nick processing the mornings catch.
The book is funny but with a serious side.
I must say i did recognise all the sterotypes and characters.