An obligation of 5 per cent. on the oil companies is a considerable driver in relation to the demand for biofuels and the opportunities for supplying them from the domestic market. I should point out to the hon. Gentleman that farmers are allowed to grow biofuel crops on set-aside land, for which they already receive a payment. They get a payment for the set-aside and a payment for the crop, and there is also the encouragement of a 20p per litre discount.