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@Wheelnut
Tru-Wel tube was a fairly light high tensile steel, better than ordinary steel tube but not considered quite as good as 531. There were several versions of Tru-Wel including double butted chrome molybdenum steel. Yours is probably 201, a high tensile tube, but not seamless.
I think this model is similar to yours: http://www.bikebrothers.co.uk/carltonten.htm
Carlton may have been a factory producer but they always made fairly decent stuff.