My old man used to have one of those, don't often see them. Those wrap around seat stays look exactly the same as on my Carlton, also made in Worksop, I think they were made by the same people. I like it.
http://www.classiclightweights.co.uk/carlton.html
@Platini started
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http://www.classiclightweights.co.uk/carlton.html