@SkipdiverJohn It's amazing the volume of builders in London during that period. And you're right, a lot seem to based in South London - maybe as a result of former Holdsworth and CB builders setting up on their own? I wonder how many lightweights were built in London in say, 1953? An interesting project for somebody (i.e. not me!) would be building a custom google map with the sites of all the London (and beyond) classic frame builders former premise's pinned on.