Crops for fuel, Scotland's native bees, the ancient craft of tanning

Farming crops for fuel is a controversial subject - we begin a week of special reports with an interview with Hannah Evans, an analyst at the Energy Technologies Institute. Scotland's native bee population is under threat from non-native species - a new group is being set up to save the Scottish bee. And a report on the ancient art of tanning sheepskins.
Presented by Sybil Ruscoe.