Along_the_Wire Demographics of the area will be important too - 78% over 70s probably helps.
You would think, if that’s the case, that areas with a higher proportion of old people would be getting to the younger ones later.
I reckon it’s Tory areas being prioritised, Chester sometimes used to be Tory but now we return Chris Mathieson (Lab) with a huge majority every time because he’s just an excellent constituency MP, we’re probably being punished by an ‘algorithm’ for it.