The 10% +2mph was an unwritten rule of thumb the police used. Thanks to wankers like Roadpeace and Transport2000 who challenged this ruling you are quite likely to get done for 31mph in a 30mph limit. Tossers

In Herts you have to be a reasonable way over before the Gatso will go off (40mph in a 30 is the normal trigger speed from the info I was given). Herts use no dummy camera's at all if you get flashed you will get the NIP.

Never mind there is always section 2 of PACE