Great Website i've found, some may already use it but if not worth a look. Once you register it gives you the cheapest garages in your area for your chosen fuel type. You can generally get Super UL for the price of Normal UL if you look around. Even gives you a map.
http://www.petrolprices.com/
Another thing I've registered with is
http://www.pipelinecard.org/
it's an idea by car enthusiast Ben Scammell who has been campaigning actively for a reduction in fuel prices for several years. His aim is to collect members then negotiate a discounted card with a certain supplier if everyone buys from them. So far he has 90000 members. He thinks he can save upto 10p a litre. Costs nothing to sign up so nothing to lose.
Now got 400 miles on the car. Not stopped smiling yet :lol: