Hmm - might be worth considering. I have a saily boat - so a couple of 25l cans every so often really isn't an issue (I normally refuel that way anyway)

If I bought and paid for and kept the receipt for a few 100 gallons that would see me through the next x years. Storage would meet requiremenst (as it has to on the farm anyway) - diesel wouldn't actually get old - as the tank would get recycled every few months (I suppose effectively I'd be lending my diesel to the farm and they would then replace - wonder if tax man would try and make something of that ..)

I guarantee the tax man won't like it if he can be bothered to check - but if its legal - might be worth considering ..