Either way I did some draft calculations and the maximum per litre I'm willing to pay is £3. After that, well they can go **** themselves.
I'll be back in a Rover 220SDi well before things get that far, back to running on veg oil! At £3 a litre i'd not be willing to commute to where I work anymore, i don't earn enough to be spending that much on fuel!
At £3 a litre it'd probably even be worthwile me running on red diesel and just risking it.