Originally Posted by orlok
I agree that passageway seems most appropriate. We use "jitty" here in the Midlands, but in our case it refers to a narrow unpaved lane, so there could be confusion in the wider world if you called it that.
That's called a ginnell here, but I've also heard it called a lonnin. I think I'll probably go with passageway, that seems to be the most multilingual.