Just let's not go down the Blair + Brown route shall we?
It took only a couple of years for people to forget that Blair and Brown government threatened any local authority wanting to improve traffic flow with a reduction in their budget equivalent to the loss to the exchequer from less fuel being burned at start/stops.
We are now back at it again - we are looking at sabotaging a technology which can potentially reduce urban pollution and make thousands of lives better instead.
FFS, taxation is a form of "buying civilization". Just tax the lot. Actually start by taxing the Pri(ck)us infestation in London. There is way too many of them defeating the "congestion" part of the congestion charge.