I have just received this through email from a fellow trading collegue. If you care about being over-charged for petrol than give it a read and act on it. Stand up and make a difference!

Subject: Campaign to Reduce UK Petrol Prices

You might find this of interest
We are going to hit close to 89p a litre by the summer. Want petrol prices to come down? We need to take some intelligent, united action.

Philip Hollsworth offered this good idea:

This makes MUCH MORE SENSE than the "don't buy petrol on a certain day" campaign that was going around last April or May! The oil companies
just laughed at that because they knew we wouldn't continue to hurt
ourselves by refusing to buy petrol. It was more of an inconvenience to us than it was a problem for them. BUT, whoever thought of this idea, has come up with a plan that can really work. Please read it and join in! Now that the oil companies and the OPEC nations have conditioned us to think that the cost of a litre is CHEAP at 77p -80p, we need to take aggressive action to teach them that BUYERS control the marketplace not sellers. With the price of petrol going up more each day, we consumers need to take action.
The only way we are going to see the price of petrol come down is if we hit someone in the pocket by not purchasing their Petrol! And we can do that WITHOUT hurting ourselves.

Here's the idea:

For the rest of this year, DON'T purchase ANY petrol from the two
biggest oil companies (which now are one), ESSO and BP. If they are not selling
any petrol, they will be inclined to reduce their prices. If they reduce
their prices, the other companies will have to follow suit.
But to have an impact, we need to reach literally millions of Esso and
BP petrol buyers. It's really simple to do!! Now, don't whimp out on me at
this point...keep reading and I'll explain how simple it is to reach millions of people!! I am sending this note to a lot of people. If it reaches you, send it to at least ten more (30 x 10 = 300)... and those 300 send
it to at least ten more (300 x 10 = 3,000) ... and so on, by the time the
message reaches the sixth generation of people, we will have reached over
THREE MILLION consumers! If those three million get excited and pass
this on to ten friends each, then 30 million people will have been
contacted!
If it goes one level further, you guessed it... .. THREE HUNDRED MILLION PEOPLE!!! Again, all You have to do is send this to 10 people. That's all.(and not buy at ESSO/BP) How long would all that take? If each of
us sends this email out to ten more people within one day of receipt, all
300 MILLION people could conceivably be contacted within the next 8days!!!

I'll bet you didn't think you and I had that much potential, did you?!

Acting together we can make a difference. If this makes sense to you, please
pass this message on:

PLEASE HOLD OUT UNTIL THEY LOWER THEIR PRICES TO THE 69p a LITRE RANGE Action:

It's easy to make this happen. Just forward this email, and buy your
petrol at Shell, Tesco, Sainsburys, Morrisons (75p)Jet etc. i.e. boycott BP
and Esso.

TELL ALL YOUR WORK COLLEGUES, ALL FRIENDS AND FAMILY, TOGETHER WE CAN DO THIS AS WE CONTROL THE MARKET NOT THEM AS THEY LEAD US TO BELIEVE!

and that was 2004.