". . . I believe a lot of aircraft used brazed-up 531 steel tubing so after the War there were a lot of very experienced torch wielding men and no doubt women. There was a vogue for lugless frames because of the lack of lugs with the new 'Continental' angles and some these people found work readily . . . "
Mark,
What do you mean by "continental angles"? In the early 1960s I raced in Belgium in the environs of Antwerpen on bikes called CYCLES OK. They were lugless frames made with straight gauge Reynolds 531. Though it's 15 years after the war, do you think there's any connection? Scotland and Flanders are not far apart by sea. Also, I doubt that aircraft used db tubing.
REgards,
Michael Allison
New York, NY