The UK is what they call a "performative" culture, which explains their extreme class accents more than any bullshit about isolation in the age of trains.

The importance of "proper"ness proves that they live their lives like soundbites rather than of whole tradition or from principle. I approximate here, but I do not exaggerate.

It pops through in ways where they punish disobedience in what looks like petty ways (drones arresting people walking alone in the wilderness) or rewarding obedience in petty ways (this example). But they don't follow through to the logical conclusion, because they're all just taking their stupid acts and accents as far as they can.