Via sportsman extraordinaire Dan from Madison, this fascinating video shows the operations of a British bicycle factory in 1945. If the factory shown is not a composite it may be the Raleigh works in Nottingham. (The video shows Rudge branded bike frames being made. Wikipedia says that the electronics — now music — company EMI bought the Rudge name and produced bikes from 1935 until 1943 when they sold the brand to Raleigh.)
The video was a promotional effort on behalf of British industry. In hindsight it shows British industry on the cusp of postwar decline. But that’s hindsight. The bicycles shown are pre-war designs, variations of which are still used in much of the world. (Many of the bikes shown in the video would have been exported, perhaps mainly to what are now the Commonwealth countries.) Updated versions of these bikes were popular in the USA until the 1970s when they began to be superseded by more modern designs. Since then the Raleigh brand has passed through multiple acquisitions, and Raleigh bicycles are no longer made in Britain (I have no idea when the Rudge brand was last used).
Increased wealth and the automobile eventually killed off most demand for bicycles as routine transportation in developed countries. The video shows crowds of English people in business dress, including at least one woman in heels, cycling about. Nowadays most of them would drive or take buses or trains (even if, as I suspect is the case in the video, they work for a bicycle manufacturer). But in the hard times of 1945 the bicycle would have been the best short-distance travel option for many Britons and Europeans. And in Britain’s post-war socialist austerity the bicycle industry, like every other British industry, needed all the help it could get.
The US National Association of Manufacturers once posted a similar video on its blog, showing operation of the Columbia bicycle factory around 1950. I can’t find the original video but this YouTube seems to contain much if not all of it: