At a London CCTV center, operatives monitor thousands of citizens every day. But does the public realize how surveilled they are? And do they care? — Eleven years ago, a giant mural appeared in Newman Street, central London, of a boy in a red jacket painting the slogan, “One Nation Under CCTV” in stark white capitals. His actions are filmed by a painted policeman next to a barking dog. Right above the mural was a real…