Which one?

Very few people use "Queen's English" as their normal mode of speech. It was created as a reference accent, since we had so many across the empire, the toffs could struggle to understand their staff.

Outside of that, it varies wildly. E.g. the "pirate" accent is actually just a rural Cornish accent.

Often, you can figure out where someone grew up, down to around 10-20 miles, based on their accent. Though that goes out the window when people move around and blend multiple accents together.