I find it amazing how few people can actually grasp how petrol prices are arrived at, and are quick to blame the oil companies or current governments.
For a start, the current Conservative government, as already mentioned, have actually frozen fuel duty (and I believe at one point reduced it), compared to the automatic fuel duty escalator employed by the previous Labour government. So in fact, the current government tax take on fuel is significantly less than it "could" have been under the previous governments plans. Thank you Mr. Osbourne.
Secondly, again, as mentioned earlier, the fuel in the pumps wasn't extracted out the ground yesterday. It was extracted many weeks ago, and has since been processed. Hence the "slightly" higher rate we pay today, although it is still substantially less than we were paying 6 months ago.
And low Oil prices are far from a good thing anyway. Low oil prices, whilst helping with day to day motoring costs, actually costs the country a LOT. If the oil companies don't make profits, which they aren't from North Sea oil just now, then there is nothing to tax. If they are not making profits, there is no further investment, meaning no new jobs. It also means they have to start scaling back operations, which means a LOT of reasonably well off people start losing their jobs. This means, again, less tax income for the government. Moreover, these people may well start claiming benefits.
But it's not just the oil & gas workers who are hit here. If they have less money, then they spend less, obviously. That means house renovations and such like are at least postponed, if not cancelled. And that hits joiners, plumbers, sparkies, builders etc... Then there are even more people with less money to spend. Which hits all parts of the economy. Less profits all round, so less taxable income for the government.
Sure, it's nice to fill my motor for £65 or so. But at what cost? Surely an £80 tank is a better compromise, allowing many people to keep their livelihoods.