Hello,
Phonetically, does RP encompass:
Englishuser
'Sounds' to me like John Wells is describing HRH Elizabeth II's accent... Or "the Queen's English" And that would be a URP accent, wouldn't it? Or at least was...
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It's fairly well documented. From the BBC Radio 4 website comes the following: The acme of aristocracy is the royal family, but even the Queen's English has changed over the years since her coronation in 1952. So much so that "The Mirror" famously declared, "Er Madge don't talk so posh any more".