English accents and dialects vary more widely within the U.K. itself than they do in other parts of the world owing to the longer history of the language within the countries of the U.K.
interesting. i’ve got into discussions about this before and my opinion has been firmly on the side that though it seems that way to me i think it’s more because i’ve got a uk accent, and uk accents are what i’m used to and so i can distingush uk people’s accents from each other more readily than i can people’s accents from other parts of the english speaking world. seems not.
from how to tell the origin of an accent at wikipedia.