Robin I am afraid that we are in a catch 22 situation here. Remove the cameras and crime detection rates go down but we can rest easier that we are not being "spied" on.
As someone said earlier, if you are not doing a crime dont worry about it. I doubt cctv pictures of my good self walking down the street picking my nose will make headlines but I do hope that cctv will be used to assist with the prosecution of Sundays armed robbery etc, et.