In reply to Dave the Rave:
Are Scousers truly from the North or something else tacked on? Anywhere east is just woolybacks. Are Geordies just east coast Scousers? Where doers that leave the Mackems, Sand Dancers, Smoggies and Monkey Hangers etc?
Anyway. my point: I think there's a west coast thing you can trace down that side of the country, Brum accents shading into deepest ooh aaarr, as the Archers cast demonstrate.
I'm not sure how this might apply to the east side, south of the Humber. For obvious reasons.