There is no such thing as a British accent............
There are British accents
Yorkshire has many subtle sub dialects, as does Lancashire, not to be confused with Manchurian, or Scouse (Liverpuddlian).
As much as a Jordie will not thank you for confusuing his accent with folk South of the Tyne.
Cockneys are mythical creatures now morfed into EastEnders and there is no such thing as a London accent. It is basically a home counties drawl mixed with chav overtones derived from North Kent and the Essex Marshes.
The Midlands equally intone a corruption of Brummie which inturn is derived from the straight cut Black Country dialect. Not to be confused with the singsong version bespoke by folk from Walsall and its environs.
There are of course Welsh and Cornish accents but they are Celts and therefore of suspect lineage and dont count in the import of such things.
"West country" accents therefore are derived from the area of Bristol and the Somerset levels....unfortunately being somewhat "yokel" in nature and presenting the orator with the appearance of a less than average intelect.
Whilst "West Country" is particularly poor at enhancing the apparent IQ of those who may be so afflicted. But none of the a forsaid accents promote a higher IQ than that of "Queens English" which is now somewhat (thankfully) as popular as Latin as a spoken language.