That's probably why they didn't find my stolen car. Grrr.We were once woken at stupid o'clock by the police helicopter hovering low somewhere nearby. After a few minutes and mightily pissed off, I rang police HQ to ask them if PC Biggles wouldn't mind hovering a bit higher and use the zoom lens on his camera a bit more. The female inspector I spoke to told me it was a well known phenomenon that helicopter noise was louder at night. I rather suspect she was taking the piss but shortly thereafter the noise Biggles was making did seem to decrease a little.