Character Analysis
The constable's a kind-hearted guy who's always looking out for other people. And—bonus—he knows how to score some free food. Gotta get that bangers n' mash, guv'nor.
He brings Jane and Michael back to their house after they "run away" at the beginning of the movie, though the constable kindly explains that it was actually their kite which got away, and they were just chasing after it.
We just get a short glimpse of the constable, who tries to chat with Mr. Banks. But Banks is so uptight, he acts stilted and formal throughout his whole interaction with the constable. Banks doesn't know how to talk to people who aren't from the same class background as him, although he does say that the cook will make some food for the constable.
And free food makes up for anything.