Never a spillage with the old ones?? How about being at 10,000ft DA above a foreign country not normally associated with the RAF?? The tank vent had not been unplugged and it burst open. I can confirm that you can open the doors both sides and use your hands to 'slosh' gallons and gallons of fuel overboard. I was drenched from head to foot in AVTUR. The nav leg was very very very interesting without all that fuel available and a lot of very hostile jungle below................