None were built outside velosport my father built all the columbus handbuilt frames. Some were crit frames other road and one track frame. Only about 10 frames ever built. Workshop he used to build frames was witcomb cycles in london
Late reply as only just joined the forum but can definitely confirm 100% that all the velosport frames were built by my father Ted Henderson owner of velosport in Norwich. All frames were built old school on an open hearth forge using bronze. All frames were original Benotto champagne in colour...
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This thread just caught my eye i know its old but can give you most information you require about velosport frames .my father ted Henderson was the founder of the shop .the frame buider and wheel builder .the columbus sl frame was originally built for me .the frames were all the same...