Not a Westpac Rescue Helicopter then?

Interesting, my partner saw a bright light in the sky the other morning, I was asleep, and she couldn't wake me; but I reckoned it could have been Venus. She doesn't drink. If I'd seen it, I'd blame the drink - especially if I'd been drinking Absinthe. I did see one many years ago in Wales. I blame that one on tiny little mushrooms. There is usually a good explanation for these things. I'd play safe and put it down to a Westpac myself - otherwise you may be getting a knock on the door, and the men will be wearing white, not black...

Edit: the motion you describe sounds more like a police chopper. Used to get them a lot where I lived in the UK, using IR to track crims fleeing into the local council estate. Not seen those round Hamilton myself. Westpacs do fly into Hamilton hospital from all over the Waikato.

Pity you didn't use your n900 to take some pictures - the camera on it is pretty cool, and it is there right when you need it.