As for the whole brown sauce/red sauce thing, that's pretty much a north-south divide. Me? I'm largely in league with the "liquid poop in a bottle" brigade as regards brown sauce; it's mostly inedible, food-spoiling muck (pork pies excepted though, obv.), and red sauce ("rockin' 'orse" in true plastic-Mockney speak) is pretty much indispensable. But then, I am Essex through-and-through; gravy on chips (let alone fish FFS) is also wrongness personified.
My one concession after 25 years oop Norf (here in industrialised Cheshire
)? Curry sauce on chips is indeed the guv'nor, and I must now concede that saveloys are indeed shit.