Why do Norfolk people have the same accent as West country people when they are at either ends of the island with no connection to eachother?

Academic specialists in this area (sociolinguistics) would probably tell you that the accents are not really the same.  To the untrained ear, they may sound alike but actually are not.

Peter Trudgill published a book on Norfolk English in 2003. You might want to take a look at it.

What has that got to do with Royality . It looks as if you have put this in the wrong category probably by mistake