Regarding where the Saarf ends and 't Nawth begins, my rule of thumb is that a line between the mouth of the River Welland just south of Boston, across to Welshpool is roughly the border:
North of that line the world turns grey and grim, with clogs, shawls, whippets and racing pigeons much in evidence, tha' naws - whereas south of the line it's the land of milk and honey....and lager shandy....innit?
