[holding answer 26 January 2009]: The Ministry of Defence has been working on alternative energy sources for several years. The RAF has led on examining fuel efficiency and alternative fuel sources, including the wider application of biofuels across the land, sea and air environments. In 1999, RAF aircraft were among the first in the world certified to fly on up to 50 per cent. non-crude oil derived synthetic fuel. Since 2008, RAF aircraft, excluding the Battle of Britain Memorial Flight and a few small training aircraft have been certified to use 100 per cent. synthetic fuel.
The MOD is also working with industry to develop ideas to achieve reduced dependency on fossil fuels.