Great post John.
I have to admit to having only skimmed your post so far, and whilst I apologise for that, I would like to see the discussion progress. I will have a proper read when I get chance - probably tomorrow - and will post further then.
I initally like the idea of road tax being geared towards mileage/MPG, personally it would suit me. I suppose though that the more juice you use the more tax you pay because of the barmey amount of tax we pay on fuel.
Likewise I too get hopping mad at uninsured drivers - we all end up paying for them by having to pay higher premiums
In fact don't get me on these social issues, I'm going to have a beer to calm down