Mother Christine Lord becomes obsessed with the now infamous episode of agriculture minister John Gummer feeding his daughter a beef burger on TV in 1990. She wants to know what killed her son - and beef is the prime suspect. But as she investigates, she finds all is not as it seems.
Three decades on from the incident, John Gummer casts doubt on the widely-believed story that infected beef is what caused vCJD in humans.
Written, presented and produced by Lucy Proctor