now this will probably stir things up a bit but you can do it this way.
buy biodiesl heating oil, then when you get it home, change your mind and decide to use it in your disco.
you will probably have to buy 200l min at a time but you should be able to get it for under £1.00 per L as there is no road fuel duty paid on it.
get a book and make a note of when you "changed" it to a road fuel and the qty.
don't use more than 2500l in the last 12 months, the supplyer will have records to protect them and if hmrc see you buying loads when they check the suppliers records they will pay you a visit and it will be game up.
when up to your limit you can still buy duty paid biodiesel.
you could also buy svo from bookers or costco, 20l currently £18.99 & £17.99 respectivly i would only run 50/50 during current temps with maybe 5% unleaded.
