How does Penelope meet Ambrose Keeling?

One night as Penelope is walking back to the Wrennery, a car pulls up behind her. The man in the car, Ambrose Keeling, offers to give her a ride, which she accepts. She is up front in telling him that she hates the job and he asks her out on a date for that evening. He waits outside the door and she runs inside to change from her uniform to civilian clothes. They get along wonderfully and agree to go to London together. He is surprised that she is not restricted by many social conventions and immediately sees her as the child of bohemian parents.