To continue my love of the London Underground's design I have created this post on a small collection of maps and guides. They date back to 1976 and I have compared some to the designs used at the moment to see how they have changed.
From left to right: Not dated, 1974, 1974.
1976, 1979, 1986, December 2012.
Top: 1976 - Bottom: 2012
This is my favourite purely for the photo of the typical British gentlemen in the bottom right corner.