the point to the limit Karl was just that there was a huge fuss about SVO/WVO a few years back until the authorities discovered that only a tiny handful of vehicles could successfully run on it, then when home-made biodiesel came in, that too had problems that made it a seriously minority interest, so they figured it was easier to make a small concession to the alternative fuel brigade, but not one big enough that it offered an incentive to big commercial users, hence the 2500 litres/year limit. If you use 2501 litres you pay duty on THE LOT, and its a requirement that you maintain detailed records of usage for that reason but as Daved will tell you, HMRC and the scuffers aren't interested these days, unless your diesel is RED that is! LOL
