Just found out where's a couple of places near our Lytham office wot do biodiesel. And since I drive over there and back once a week I thought I'd give it a go, so on the way home last night I filled up at 93p/litre instead of 109p/litre :)
That's nearly a tenner less per tankful...
Note to self: buy new fuel filter ;) And some jerry cans so I can fill up at home.