The chart shows the resident populations of London’s inner boroughs and the City, as well as the daytime flows in to or out of these areas (2011 data). Westminster, for example, has a net influx of about 800,000 people; Lewisham has a net outflow in the several thousands. The daytime population of inner London is 68 per cent higher than the resident population, according to the think tank. Little wonder that any suspensions of train services can have a significant effect. Read more