Bonsoir !
A) 1) It takes place in a car: "I continued to drive slowly" (l.1), "trying to save petrol" (l.1), "Calculating Route" (l.19).
2) The narrator is alone in his car. Emma is the name he gave to his GPS and Caroline is someone he knows in real life, possibly an ex-"partner" (l.4).
3) According to the narrator, Emma is submissive ("She accepted my authority, and responded accordingly." l.22) and self-controlled ("Totally unflustered" l.20).
B) 5) Stafford Whiteaker has decided to become a hermit. He wants to move to the "more solitary life" (l.11).
6) He is going to stay in a house, or according to him, a "cell" (l.7), near Shropshire, "some 50 miles away" (l.4-5) from the Malvern Hills. The fact that there is hardly any sign of human habitation is what's special about this place.
7) He has made that decision because he doesn't feel at place in "our Facebook and Twitter-obsessed age" (l.9). He feels "absolutely right" (l.13) about it his choice, and already thinks it's "lovely" (l.7) and "incredibly welcoming" (l.13).
8) Both narrators want to be "left alone" (Doc. A, l.9) and not have to listen to "other people chattering away" (Doc. A, l.9).
9) They completely differ, because narrator A seems to dislike everyone in general, while narrator B seems to at least have a friend ("let me visit" l.10).
