This rather lovely map was produced by Dr Ed Manley, a research associate at University College London's Centre for Advanced Spatial Analysis, to help understand the relationships between where Londoners live and work.
Oyster card data from the tube, Overground and rail networks for the most popular destinations between 7am and 10am on weekday mornings produced a whopping list of 48.9 million journeys. Dr Manley told the Standard:
"Looking at morning peak, as we have done here, we can start to understand a little more about the relationship between where people live and where they work.
"For example, the map suggests that if you work in the City, you’re more likely to be living out in east London or Essex. Likewise, if you live in south London, you’re most likely to travel to either Waterloo, London Bridge or Victoria, depending on your rail connections."