Not really a quick question, but it's not worth a whole thread on it's own.
We live in a flat, and upstairs neighbour is a pain in the arse: Smoking out the window (we get it drifting into our flat), music blaring (we can hear it over the telly on a regular basis) and just general banging and stomping about. We've tried knocking the door for a chat, but get no response (and we kinda don't want them to know it was us that's called the noise polis in a couple of times). We're pretty sure they're renting the flat.
The question is, who can we get in touch with to help sort it out?