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In short: “estuary English” has replaced them. What is Estuary English? It’s cockney but less harsh…
They only interviewed 193 people to analyze their accents, though.
The title of the article is click-baity, but the article mentions some topics in linguistics that are actually interesting.
There’s a really good book I’ve been reading, which goes into detail about the development of the old RP accent (aka “BBC English”) into “Standard Southern British English”. It has a lot of detail about the individual sound changes. If you’re an accent nerd, you’ll probably enjoy it.