Increasing food prices is not only a UK concern I am afraid... In Greece cereal prices have doubled this year. Durum wheat seed was sold to farmers at 0.33 euros per kilo on 2006, but 0.67 euros per kilo this year. The cost of production therefore is allready increased, combine this with the increased oil prices, the increased fertilizer prices (30% up) and you get the whole picture... There is no doubt that we will start with a high wheat price at next harvest ...
There are also problems with wheat production in Russia, making the whole situation even more difficult.
Countries like China, the more they develop the more food they will demand. More and more people will leave the undeveloped chinese countryside and go to the big cities. Living in the cities though means that you do not produce, therefore you need to buy food. Also life in the cities increases meat consumption, therefore more meat will need to be produced and more cereals are going to be needed for animal feed.
Biodiesel production is also affecting food prices, as products like cereals, maize, sugarbeets and so on can also be used for biodiezel production instead of food.