Michael Buerk and Bettany Hughes continue the countdown of the 50 greatest treasures found by the British public. Bettany goes diving for Roman treasure, Michael Portillo investigates a two-headed 2000-year-old coin revealing a political coalition, John McCarthy tells the story of a jewel-encrusted cross, a jar full of gold coins found on a Hackney council estate reveals a story about the Nazis, and John Sergeant checks out a hoard of French coins which could be forgeries.

The countdown of the 50 greatest treasures found by the British public continues from 18 to 11. Jon Culshaw goes on the trail of some Viking treasure which gives a clue to the origins of the north/south divide, Dan Lobb reveals how a Bronze Age stash proves that the import and export business was thriving 3,500 years ago and, in Nottinghamshire, Anita Rani tells the story of a medieval chess piece - a 12th century metal knight. Presented by Michael Buerk and Bettany Hughes.