Oh this is going to be fun. I see you're referring to the "Metro area of London". when referring to that size. The size of London proper is 1,572 km2 (Wikipedi

Oh this is going to be fun. I see you're referring to the "Metro area of London". when referring to that size. The size of London proper is 1,572 km2 (Wikipedia, as well) So now, the fun question is "what area is the camera count referring to?" Further, the quantity of cameras matters less than the areas the cameras can see that is covered. Even further-further is how easy it is for the government to acquire the footage off those cameras.