For 10 points, name these surveillance devices that are ubiquitous in London.
Daniel Hamilton is the head of an organization that opposes the proliferation of these objects. Â Much of the financing for these objects came from fundraising initiatives called City Challenge Competitions, which begun in earnest after the murder of James Bulger. Â An early group of these objects, put in place following the Bishopsgate terrorist attack, was known as the Ring of Steel, and McCahill and Norris estimated that there were over four (*) million of them in the United Kingdom. Â A scandal erupted in the 1990s after it was revealed that a group of these objects in Heathrow airport were not functional. Â Ken Livingstone used these objects to enforce his traffic congestion plan by identifying cars via their license plates. Â For 10 points, name these surveillance devices that are ubiquitous in London.
Daniel Hamilton is the head of an organization that opposes the proliferation of these objects.
video cameras [accept equivalents; accept anything referring to CCTV]