Mill Hill East - Least Used Northern Line Station

We're counting down the least used stations line by line on the London Underground, this time to the Northern Line and the oddity that is Mill Hill East. You can download the Entry & Exit figures for all Tube Stations here: https://tfl.gov.uk/corporate/publicat... (although, it will obviously spoil the series for you if you look ahead at the figures!) Note: The Waterloo & City Line won't be done, as it's only two stations with passenger figures that are ridiculously high, because the stations are Waterloo and Bank. There's scope though to do 'Least Used...' on the Overground, DLR and Trams.