As Jack Campin says, it stretches into South Yorkshire. I also apply similar tones to reading contemporary Flemish texts, where the language is starting to diverge: the modern "en" which I discuss above is at that time "end", very clearly a very short distance from "and". The language of the 13th century is only about a hundred years away from AngloSaxon, which has much of the Saxon language of the Low German mercenaries who were awarded Flanders after the Battle of Kassel in 1071 saw the defeat of the French Duchy of Flanders. It was reinforced by the defeat of the Angevins at Bouvines in 1214, and left a strong political alliance between England and Flanders reinforced by the common interest in the textile trade. This general tone is probably almost universal by the time we get to the end of the 16th Century, the more effete RP tones only appearing with the arrival of Huguenots and the start of the foreign wars of the 18th Century.
Another dialect not massively far removed is Geordie: the modern Flemish will also go into a bar and say "away", meaning exactly the same thing.