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In UK/Europe all colour CRTs in TVs sold to customers were rectangular. Round colour CRTs were only used in experimental and prototpe sets. Most likely imported from USA.
Not sure when last round B&W tube was used in the UK. They were certainly used in 1953 and were obsolete by 1956. Smaller numbers would have been made for maintanence after that, though that may well have been by rebuilding old CRTs.
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