Now that he's hanging around the Hillingdon area a bit more, Sirius has been picking up more information about the movements of various people in various places. It's helpful, if nothing else, to know what's going on.

The name Matt Lloyd rings a bell, albeit a vague one. Sirius isn't sure if he knows the guy, but regardless of whether he did or didn't, it sounded like he needed help. Or at least to be found. So Sirius had set off, not entirely sure how he was going to conduct his investigation, but maybe he might hear something.