Might be related to the "Queen's English" study: "An Upper-Class Southern British Accent, 1673 - 2023"

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This video is one person's attempt to describe the shift over time in the pronunciation of "upper-class" British English using primarily written transcriptions. I'm not sure how credible this guy is, but it was a fun watch when I found it last fall! I thought his attempts to pronounce these older, unrecorded pronunciation systems were both valiant and funny.

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