Scientists trying to settle the centuries-old debate of where England's north-south divide lies have sparked controversy after identifying a major Norfolk town as northern.

Researchers used the locations of Greggs and Pret A Manger stores to attempt to show where the line bisects the country, with the bakery chain seen as 'northern' and the sandwich store as 'southern'.

Eastern Daily Press: The Custom House in King's LynnThe Custom House in King's Lynn (Image: Matthew Usher)

The 'tongue in cheek' idea was that, by plotting where Greggs' steak bakes and sausage rolls give way to Pret's organic coffee and humous and falafel salad pots, a line could be drawn demonstrating the country's great regional fault line.

Eastern Daily Press: King's LynnKing's Lynn (Image: Matthew Usher)

The Sheffield Hallam University study involved inputting the longitude and latitude of all of England's Greggs and Pret stores and using that to create a northern/southern dividing line.

Eastern Daily Press: The north/south line which was initially created, using the location of Greggs and Pret A Manger storesThe north/south line which was initially created, using the location of Greggs and Pret A Manger stores (Image: Sheffield Hallam University)

And, when artificial intelligence (AI) was used to calculate another north and south boundary, adding data including Gross Domestic Household Income, King's Lynn and parts of coastal Norfolk - including upmarket villages like Brancaster and Burnham Market - were placed 'up north'.

Eastern Daily Press: The second line, using data such as Gross Domestic Household Income as well as the location of Greggs and Pret A Manger stores placed King's Lynn 'up north'The second line, using data such as Gross Domestic Household Income as well as the location of Greggs and Pret A Manger stores placed King's Lynn 'up north' (Image: Sheffield Hallam University)

King's Lynn has three Greggs stores, with a fourth on the way. Unlike Norwich - with eight Greggs and one Pret - which was defined as 'southern', it does not have a Pret.

Eastern Daily Press: Greggs was seen as 'northern' for the purposes of the studyGreggs was seen as 'northern' for the purposes of the study

The report said: "It assigns the top of Norfolk, including King’s Lynn and the Norfolk Coast Area of Outstanding Natural Beauty, as northern.

Eastern Daily Press: King's Lynn is considered 'northern' in the new studyKing's Lynn is considered 'northern' in the new study (Image: Mike Page)

"Norwich avoids this and remains classified as southern.

"It is notable that the predicted line from both of these calculations passes close to the Watford Gap services on the M1 motorway.

"This has long been touted in British conversation as a location that lies along the English north-south divide."

Eastern Daily Press: King's LynnKing's Lynn (Image: Matthew Usher)

The scientists said their study was "light-hearted" and acknowledged that it had "significant limitations".

Not least of those limitations were that Cornwall - at the southernmost tip of England - was classified as 'northern'.

Eastern Daily Press: Pret A Manger was classified as 'southern'Pret A Manger was classified as 'southern'

Northern, Southern or Eastern? What do people in King's Lynn think?

People in King's Lynn and the parts of Norfolk defined as 'northern' in the study were not convinced by the label.

READ MORE: Historic photos show King’s Lynn over the decades

Eastern Daily Press: Andrew JemiesonAndrew Jemieson (Image: Norfolk County Council)

Andrew Jamieson, Conservative borough and county councillor, said: "I think I'd consider myself eastern and I am not convinced that people in leafy Brancaster and Burnham Market are going to see themselves as northerners."

Eastern Daily Press: Rob ColwellRob Colwell (Image: Rob Colwell)

Rob Colwell, Liberal Democrat borough and county councillor, said: "I see myself as an East Anglian and a European, but if you put me on the spot, then I think I'd say I was a southerner. It has certainly raised a few eyebrows."

Eastern Daily Press: Alexandra KempAlexandra Kemp

Alexandra Kemp, independent borough and county councillor, said: "We consider ourselves to be eastern. We have a distinct identity and history, as a port town and member of the Hanseatic League."

Eastern Daily Press: People in King's Lynn are not convinced they are 'northern'People in King's Lynn are not convinced they are 'northern' (Image: Matthew Usher)