150 Years of London Undergrand (Tube): A Documentary from 1963

Yesterday, London celebrated the 150 years of the iconic transportation method by a steam powered train. I think many of you watched the footage or saw the photos. So, I did some YouTube research to watch something related with the London Tube and I found a documentary of London Tube.
London Tube documentary on YouTube was from 1963, 100 years of the London Underground. I really don’t whether it is available on DVD or Blu-ray. However, I embedded the video from the YouTube. If you have time, please watch and if you found an original copy, please buy it :)