Flickr/Warren Chrismas. Some rights reserved.
If you want to know how the UK came to be the most watched nation in the world, with CCTV on every corner, you need to go back to 1942: the now ubiquitous policing aid was first developed for use in missile testing by the German military.
Tear gas, GPS trackers, pain rays and surveillance drones – technologies developed by the military for use against foreign enemies have a habit of finding their way into the hands of civilian police forces.
