Well it appears that Bush will deliver a final ultimatum this evening and that war will be declared tomorrow. Blair is going to take Britain to war against the wishes of the greater part of the electorate. Democratic methods have failed to persuade Blair to change his mind so we are now left with non-violent direct action to get our message across to him. Small isolated actions although good will not generate enough publicity - we need to bring the country to a standstill!
As the fuel protestors showed a couple of years ago it would be fairly easy to bring the country to a complete standstill within a very short time. Supermarkets and the such rely on 'just in time' deliveries to suppply them with goods, and large numbers of people commute to work over long distances everyday. Thus blocking the nation's transport will readily bring the nation to a standstill.
Luckily, thanks to years of mismangement and a drive for larger profits the trains are already up the pooper and most of the country's freight now goes by road, as do a large number of commuter journeys. So if we could block the roads the country and the economy will be greatly disrupted. If the roads are blockaded for a long time the country will fall into chaos and Blair will have to pull back from war.
Surely blocking a motorway cannot be that hard - it only has three lanes, and less than ten cars could block a motorway in one direction completely. Obviously there are safety issues here, bringing cars travelling at high speed to a stop, although this could easily be achieved. A convoy of cars could travel along the motorway, and several (10?) miles before the point of blockade, at least one car moves into each lane. The convoy then slows down very gradually, until it comes to a stop where the blockade will be. Everyone could then get out their cars and have a picnic/party/football game on the clear tarmac. Brilliant.
It'd probably be a good idea to keep the hard shoulder free for emergency vehicles to use, and have some water and cakes to give to the grumpy drivers caught up behind. And of course lots of banners and leaflets...
Unfortunately I don't have a car...