This proposal (the Observer clipping was dated June) seems to rely on ALL cars having government monitored GPS locators on them. This will take some time to impliment.

The figure mentioned is almost certainly an "offer price" so when it comes down to an extra 10p per mile we will think we got a good deal...

Large cars cost about 50p per mile to run already, most of which is NOT fuel tax.

Lots of variables, and the bulk of the proposal is not to reduce carbon emissions but to reduce congestion, so those of us going uncongestedly at funny times will probably not pay the most.

The sky is probably not falling (yet( - but never trust a politician, and remember the government pays for his travel!