Here's a nicely amateurish and enthusiastic short (9 minutes) documentary on the Northern Heights Plan – a continuation of the Northern Line from Mill Hill East to Edgware and then up to Bushey Heath – that never got built (via):
by Jay Foreman and Paul Kendler.
And if you go here, you'll see how this all links up with my photo yesterday of Crouch End station. What a small interconnected world it is, to be sure.
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