The problem with most attempts at a Brit accent is the simple fact there isn't "a" Brit accent, there are hundreds, all different.  Even my home town, Sheffield, has at least 4 quite distinct ones.  Non Brits may not be able to tell the difference between the 4 at first but to a local they say a lot about the socio economic background of the speaker.

On a more general level, each town/city has a distinct accent, most of which will be part of a wider area, so there are definite starting points for non Brits to work on.  For example, Sean Bean's natural accent is a Sheffield variant, same as mine.  They form part of the Yorkshire accents, which are a subset of Northern accents.  Quite a lot different from the folks down South.  We often refer to them down there as "Soft Southern Shandy Drinking Poofs" and they reply in kind by calling us "Northern Scum".  :)

BTW, over here, the south is rich and the north is poor.  Opposite way from the US.  :)

Oh yeah, speaking of Sean Bean, his accent in the remake of Hitcher was lousy.  His own would have been much better.

Coppula eam se non posit acceptera jocularum.

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