NOTES: Margam Steel Works, originally and colloquially known as the "Abbey Works", was a modern integrated steelworks which began production in 1953, although most of the works had been built by 1951. This is one of the two new furnaces built in the 1950s. Once the new number 4 and 5 furnaces began production, the older furnaces, numbers 1 and 2 built in the 1920s, were demolished. The number 3 furnace, built in 1941, was retained as a stand-by.
NOTES: Stewarts & Lloyds, a steel tube manufacturer, was created in 1903 by the amalgamation of two of the largest iron and steel makers in Britain, A. & J. Stewart & Menzies Ltd, Coatbridge, North Lanarkshire, Scotland and Lloyd & Lloyd Ltd, Birmingham, England. It was formally dissolved in 1997.