I've seen people chuck tyres over the gatso pole, then put a milkbottle full of petrol with a wick inside the tyre.
The burning rubber + carcass detroys the camera completely!
I bet if the whole country was done in a day, the government might call it a day.
Then again maybe they'd probably purchase SPECS cameras like they have in Nottingham.
http://www.ukspeedcameras.co.uk/guide.htm
Can we ever win?