The story of one of Britain's biggest-ever food-related crises, the outbreak of BSE - or mad cow disease - and its human form vCJD, which was first identified in 1996 and has been responsible for around 200 deaths since then. BSE first broke out in the 1980s, spreading rapidly across the country through infected meat-and-bone meal being fed to livestock. It eventually entered the human food chain, leading to the culling of more than four million cows and almost destroyed the British beef industry.