Newcastle, OMG! Newcastle. A few years ago, hubby & I were going through customs at Heathrow. The older customs agent didn't skip beat asking us if we were "taking an interpreter" when we told him our next stop was Newcastle. Since we'd been in Newcastle before, we immediately got his point. I speak a couple of languages in addition to (American) English, but Newcastleonian isn't one of them. It's just too hard to learn!
I mentioned in another thread that we had so much trouble understanding a server in a restaurant in Newcastle that someone else had to come over to help us. We haven't been over there since 2019 (pandemic), but we're likely to go back and deal with that unpleasantness again. We fly into Newcastle because of its proximity to Cumbria and specifically the Lake District. The other choice would be Manchester, but we've not had good experiences with the car rental companies there.