Geographically accurate Tube map

Prompted by a discussion about maps of the London Underground I had with a friend, I spent a few minutes searching for a geographically accurate Tube map that I remembered running across a couple of years ago. I’m putting it here so I don’t lose it again. The type is a little small so you might have to squint to read it (sorry, couldn’t find a bigger version).

Compare with the usual schematic version.