I phoned the (non-emergency line for the) police once, to tell them the burglar alarm on the building opposite was going off. I then had to endure 10 minutes of questions/useless info as to whether or not I wanted to make a complaint (I didn't), and the fact that if I didn't, then I could, and these were the procedures, and whether or not I deemed it to be a nuisance. In the end, I said "Look, I don't want to make a complaint, it isn't bothering me particularly, I'm just letting you know that possibly someone is breaking in and making off with stolen goods, just so that you can send someone round, and perhaps let the owners know. If someone has broken in, they've probably made off by now" ... and then I put the phone down! Never heard anything more about it.