I worked as a Fuel tanker driver for 10 years, I know that the depot I worked from was owned by BP but Shell, Morrisons and Sainsburys also loaded from the same depot and tanks.  My depot was in the Midlands, in the North West it was the other way round, i.e. Shell owned the plant and BP loaded there. Other fuel companies do the same. So I believe you cannot say A is better then B or C because it more than likely comes from the same place. We started using F1 fuels and have never had a problem since.

I know it costs more but having been a tanker driver and seen what can get into the fuel station's tanks I don’t risk it.

For a start all drivers always empty Derv into the Derv tanks first, then empty the Petrol into its tanks last. This practice is so the pipes on the tanker are then cleaned by the Petrol to remove all Derv from the pipes. But it always puts Derv into the Petrol tank, how much depends on how careful the tanker driver is, the pipes connecting the tanker to the tank at the fuel station are 15 foot long and 6 inches wide, and hold approximately 7 gallons, they are very heavy and should be lifted and drained to remove as much Derv as possible, (but you can never remove all Derv before moving on and emptying the Petrol). But I know in practice this does not happen, the driver just swaps pipes so a full length of pipe with Derv then goes into the Petrol. Most tanks are underground and made from steel or plastic and always have condensation in them so you get some water in the fuel. That’s why its a must to use a water removing funnel. Some Fuel station even gave the driver a tip and asked to him to put standard fuel in the super tank. (Increase their profits)

There are lots of other reasons I would not use standard pump fuel in a racing engine but that’s for another time.