Reunited at last! This is David, the brother I lost just 1,000 years ago

A scientific revolution is taking place in the study of our ancient past. Once the preserve of academics who analysed prehistoric stones and crumbling parchment, the subject has been transformed by the study of our genes by scientists who are using the blood of the living to determine the actions of men and women centuries ago.

In the process, a mass of fascinating information about our predecessors has been revealed, from the physical appearance of Britain's first Stone Age settlers to the impact that invading Romans, Saxons and Normans had on our bloodline.