Definitely not only a Northern thing - as others have said, a traditional accompaniment to chicken or turkey.
I have only ever made my own (Delia) and it’s a doddle go make.
Make my own cranberry and orange relish too.
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I do eat it throughout the year with chicken and sometimes with nice pork sausages.
(not envy!)
if truth be told I'd have more bread sauce and forget the turkey.