The UK has one of the highest numbers of CCTV cameras of anywhere in the world.

Between 2012 and 2015 the city of London saw a 72 percent increase in cameras making Londoners some of the most closely watched people on the planet. Does all the cameras make for a safer city or does the widespread rise in CCTV represent a major invasion of people's privacy. 

To find out more, read the February issue of National Geographic magazine.