http://www.alphr.com/life-culture/1008827/tfl-shared-tube-commute-tool
The actual link to the tool is https://your-commute.london.gov.uk/
I don't live in London so don't commute on the Underground so can only play with 'random' station combinations
Every day after a short 20-minute stroll taking in the local sights of a giant Asda, a petrol station and a Nando’s, I board the London Underground at Colliers Wood, before emerging huffing and wheezing atop the 136 steps at Goodge Street 35 minutes later. According to Transport for London (TfL), 151 other Londoners in a city-wide population of some eight million share in that particular daily experience.
How unusual is that? Well, it’s more common than people commuting from Upminster to Heathrow Terminal 5, as you might expect, but it’s still comparatively rare as the top ten journeys demonstrate.
The actual link to the tool is https://your-commute.london.gov.uk/
I don't live in London so don't commute on the Underground so can only play with 'random' station combinations