Yeah they didn't seem like the best source but I was lazy and that was the link that was right in front of me - and yeah the North-South divide (although it's really the London + South East vs the rest of the country) has always been a thing. It's just particularly startling when you see how bad things will be in some places, particularly Wales, the North East, and Yorkshire.
Anyone young outside of the South East and that voted for Brexit because they felt London & the South had left them behind, I think will ultimately end up feeling even more left behind.