I was driving down a road that i use a few times a week and has the average speed cameras on one section in a 40mph limit... (2 of them)

My missus was telling me about her weekend away and i had fallen into a trance and when i awoke i had only just gone thru the 1st camera at about 50 - 55...(was driving quite slow in the 60 limit due to only being semi-conscious)... so imediately slapped the anchors on and drobe at 30 until i had passed the second camera some distance (about a mile) down the road...

Now the question i have is, will i get persecuted - do these cameras take your initial speed and do u or just average it over the distance - are they likely to be working (Newark, notts area) - and should i make my missus pay the fine if i do get charged?! any info would be cool..