here's a "legal" view of the Hamilton case, giving some detail about what the magistrates may consider when such a defence is made including the liklyhood of more than one person having access to the car. The magistrates clearly felt this was a reasonable defence and thus aquitted. Not being a huge fan of politicians in general it should be noted that Christine Hamilton actually represented herself and I personally say good on you gal for taking it on and winning.
http://www.roadsidelawyer.co.uk/ques...efence-9171701
The real issue about the justice system in these cases is the cost is typically prohibitive to take on the system. I was forced to as I was in serious pooh due to totting up. This despite 19 previous years of a clean license, no insurance claims, no fines, no nothing. Never in an accident of any kind so you can judge the impact the proliferation of speed cameras and there impact.