So it's said that London is the most watched city in the world, with the UK having around one camera per 14 people. However, while some of these are shot in England, most have been taken all around the world, just to show that we're all being watched wherever we go !! There's in excess of 20m CCTV cameras around the world, with UK having about 20% of them !! Interestingly, Singapore Airport has the world's largest system, with around 3,000 cameras !