Most of the "street level" cameras are council owned and operated, outside of a few areas where the police operate them. City certainly has a lot of police operated surveillance. But venture outside the most central areas and there's not much street-level CCTV. As I've mentioned elsewhere, where I live in London it's about a 20 minute walk in any direction to see one. There are many parts of London where that is true once you venture outside of zone 1. In zone 1, yes, you'll be on camera a lot unless you sneak around back streets and on purpose try to avoid them.