Originally Posted By: andy
As I'm sure you have guessed there aren't likely to be 1 million CCTV cameras in London. [...] The figure was made by counting cameras in a busy urban area and multiplying out to the whole country.

Over here they quote 7,431, which does appear to be the result of asking all 33 London borough councils how many they have. Those numbers don't include privately-owned cameras (in shops, for instance) whose views include public areas, but it's hard to believe that there's 993,000 such.

Peter