> It would remove the annual road tax on vehicles under 800cc and raise it to punative levels on over 1500cc vehicles.

Why do that when the fuel price do most of the work?
And why write the rules with a measurmenet of engine size that might loose its technical relevance in a few years?

I would prioritize making it easy to switch over to plug-in hybrids. Your standard fuzed high capacity electrical outlets are good ones for such systems.

> It would subsidise bicycles and bicycle spare parts.

Why do that when the fuel price do most of the work?
The bueraucracy will eat such a system from within, dont start such a waste of workhours.

> It would make road systems friendly to bicycles and unfriendly to cars.

Why create conflicts when there is room for both? In my home town most people like bicycle lanes exept those who get irritated on the ones local "greens" built to be in the way for car traffic.

> It would revitalise the rail system with lightweight, slow-moving railstock.

Why slow moving when fast moving attracts more people and can be powered with electricity from manny sources?

And build more rail lines and plan bus lanes and streets to be usefull for future trolley systems.

> It would recognise that speed is not the answer, but is the problem.

Speed is not allways wastefull. Speed up some of your trains and replace more air travel.

> It would reintroduced trade restrictions.

Brilliant to slow down trade when living on an iceland that needs trade to survive...

> It would ensure that all new buildings are of solar design and as thermally effcinet as possible.

Why do that when the fuel price do most of the work?
Ok, you can hurry on the process, my favorite is to do it with good exampels. The most important part is what can be done to make the excisting houses more energy efficient. (The most important part in US suburbia is probably what can be done to cheaply fit two families into a modified excisting house. That is if my over-the-internet impression is correct. )

Yes, railways are the future. But what kind of railways? I think we should be thinking of building a new type of railway network with a substantially wider track gauge. There are substantial savings to be made here. One can transport far more goods and people for only a relatively minor increase in fuel consumption. Though the cost initially would be expensive. However, I believe the idea would be an interesting sign to send to the population that we were taking the whole Peak Oil phenomenon seriously and it might even capture the public imagination.
No

Flexibility and incremental improvements are more important then raw capacity. Wider track gauge would be good for cargo limited by volume and do very little for dense cargo limited by axle preassure.

What is being done in Sweden is a gradual enlargement of the loading profile and upgrading of the railway lines for larger axle preassure. This gives most of the benefits of a wider gauge withouth the incompatibility costs.
http://www.banverket.com/upload/pdf/marknad/jarnvagsnatsbeskrivning/Lastprofil%20A_B%20och%20C%20040 714.pdf
The intresting examples for higher axle loads can often be fond in USA, they also double stack containers wich is impossible in Sweden due to numerous bridges and the electrification.

You can also get more capacity by longer trains and better traffic control systems such as the ERTMS that is to become the new pan european standard.

Find needed railway lines that can be built with current technology and standards, getting them to run a few years earlier then odd projects should be inspiring.