There are very few people in this particular country that knock on his door at any given point of any given day, and so when John opens the door, he isn't surprised at all to see Q there. The errant thought of how he should just make a copy of the key for his boyfriend crosses his mind but then is gone again just as quickly. There's something nice about getting the door anyway.
"Wotcher," he says teasingly even as Chas gets stupidly over excited in the way that only small dogs seem to do, yipping and jumping at Q's feet. "Well. You'll have to stay now."