The Turin Shroud is one of the most revered relics of the Catholic Church: a piece of linen cloth that appears to show the imprint of a blood-stained crucified man. Some Christians believe it is the ancient cloth that Jesus Christ was buried in. In 1988, the Church allowed scientists to perform a radiocarbon dating test on a small sample of the shroud. The results are still controversial. In 2016 Rob Walker spoke to Professor Michael Tite who supervised the testing process. This programme is a rebroadcast.(Photo: Picture showing a facsimile of the Shroud of Turin at the Cathedral of Malaga. Credit: Jorge Guerrero/AFP/Getty Images)