How is this different from any dot matrix typeface of that time period? I doubt these fonts were made just for London Underground.
At least the first display's font is fairly distinct, I haven't noticed it elsewhere. The bottom of the capital letters is a pixel lower than the lowercase letters.
Printed signs from Transport for London use Johnston Sans, noticeable with the diamond-shape dots on "i" and "j": https://en.wikipedia.org/wiki/Johnston_(typeface)
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