I have tested supermarket fuel which has the incorrect amount of biodiesel in it (too high)

Interesting you say that, I thought the EU legislation only specified a minimum biodiesel content? I know they like to keep pushing it up to make it seem more environmentally friendly.

So let me get this right, we should expect many many thousands of cars to have this problem at some stage? Maybe we should all complain.

Interesting you say that, I thought the EU legislation only specified a minimum biodiesel content? I know they like to keep pushing it up to make it seem more environmentally friendly.

Off the top of my head I thought they weren't allowed to put MORE than 7% in. I wasn't aware of a minimum. I could have it arse about face though......

Perhaps as it was a Tarmac civils car, at some point in its life it's had red or even road diesel from site out of a dirty tank/jerry can filling the tank with crap?

That's correct - no more than 7%