[RayChuang88]

Maybe it's an issue with the people in the British Isles not willing to move around the country? Remember, modern transportation is erasing a lot of the regional accents in the USA, and Japan--at least among the younger generation--has far fewer dialects than in the past, thanks to much of Japan now accessible easily via the Shinkansen high-speed rail system.

[driftless2]

My wife grew up in England, and I've visited Britain several times. According to my in-laws there is becoming more and more of a standard accent thanks to media and entertainment. And people do move around there more than they used to.

When I visited Cornwall a few years ago, I expected to hear the Cornish accent with the hard r (which is absent from most English accents) spoken commonly. I rarely heard it. Many of the local people I talked to who worked in shops and restaurants sounded like people in other parts of England I've visited.