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Bromley-by-Bow became the Tube's 73rd step-free station, and more recently, Buckhurst Hill became the official 74th step-free station too, so I thought I'd go and have a look ...
Step free Tube & Rail Guide: http://content.tfl.gov.uk/step-free-tube-guide-map.pdf
Avoiding Stairs Tube Guide: http://content.tfl.gov.uk/avoiding-stairs-tube-guide.pdf
40% Tube Stations to be Step Free by 2022: https://www.london.gov.uk/press-releases/mayoral/further-13-stations-to-go-step-free
Btw, the entire clip of 'American Werewolf in London' is brillian for seeing what Tottenham Court Road Northern Line looked like back in the 1980's ...
https://www.youtube.com/watch?v=1y1nshw5Yn8