How long ago did Londoners start saying "f" instead of "th"?

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Track title: CC G Dvoks String Quartet No 12 Ame 2

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Chapters
00:00 How Long Ago Did Londoners Start Saying &Quot;F&Quot; Instead Of &Quot;Th&Quot;?
00:23 Accepted Answer Score 7
01:18 Thank you

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Full question
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Tags
#phonology #britishenglish

#avk47