Jonathan Dimbleby's organic credentials are impeccable.
Not only has he been running beef and sheep herds on his farm near Bath but, since 1997, he has also been president of the Soil Association.
But this was not always the case.
After attending the Royal Agricultural College, he was impressed by the brave new world of cheap, intensively produced food. A career, however, in the media, not farming, beckoned and this view was never put into practice.
It was only when reporting crises across the world, especially the 1973 Ethiopian famine, that he came to the conclusion that much of the suffering was abetted by human mismanagement of the environment, like soil erosion, and it was time to treat the earth more sympathetically.
