So I was going along a long road, not residential, and I genuinely believed the speed limit was 40. So my speed was creeping up (not a fast driver just didn't realise) and I see a speed van so jump on the brakes. Got it below 40 before i was in range.
10 days later I get a letter through the post "caught doing 36 in a 30". ****!
I agree to do the speed awareness course.
Less than a month later I was driving along the same road and I see a new sign: "new 40mph speed limit in force".
So they put a mobile speed camera van out to enforce a 30mph limit, catch a load of people, then change the speed limit to 40.