Courtesy of British Council Film [2], here is a documentary entitled "How a Bicycle Is Made [3]." It was made by the British Council in 1945, and it depicts the design and manufacture of Raleigh bicycles [4].
Links:
[1] http://www.library.northwestern.edu/libraries-collections/evanston-campus/transportation-library
[2] http://film.britishcouncil.org/
[3] http://vimeo.com/39401575
[4] http://www.raleigh.co.uk/