From Dr Geoff Lindsey.

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I visited picturesque Lancashire in search of surviving rhoticity — speakers who still pronounce all the written (historic) R’s.

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TIMESTAMPS
0:00 What is rhoticity?
0:59 Where R survives in England
4:02 Why Lancashire
4:38 Fieldwork in Clitheroe
6:35 Why Blackburn is stable
8:34 Where Lancashire drops R
10:19 Clear vs dark R
14:26 How R disappears
18:56 Is Lancashire still rhotic?
19:36 Intrusive R test

Further reading and viewing:

Danielle Turton’s talk on Lancashire rhoticity:

Danielle Turton & Robert Lennon (2023):
https://www.sciencedirect.com/science/article/pii/S0095447023000694