Sir Donald Curry has been an insider during the events that have brought significant change to the British countryside and food and farming industries over the past two decades. He saw at first hand the tragedy of mad cow disease - young people dying because they'd eaten British beef, infected with a mysterious cattle brain disease and a livestock industry quarantined by the rest of the world. Then came the 2001 outbreak of foot and mouth disease which cost taxpayers £8billion and set in train a rural revolution of which Sir Donald was the architect. He gives Steve Peacock his insights into this, and more, for this week's On Your Farm.