Çan any one who supports the 20 mph speed limit honestly say they have not exceeded the 20 mph limit. I've never had a speeding fine but this 20 mph is so difficult to adhere to.
Did you used to adhere to the 30 limit, or did you drive around between 30 and 35?
If the limit now means that people are driving between 20 and 25 then that's not such a bad thing is it? You won't be penalised unless you're doing at least 26 remember.