One of the firms which operates the Government’s visa scheme for seasonal workers in food and farming has had its licence revoked. AG Recruitment was one of six companies which brought temporary workers from Europe and around the world to work on UK farms. Technology originally developed to explore Mars is now being used on farms, to weed. We find out more as trials commence in Spain. And Devon Closewools are classed as "At Risk" by the Rare Breeds Survival Trust - with only around 3,000 breeding ewes, all concentrated in North Devon and Exmoor. We visit a flock at lambing time. Presented by Charlotte Smith Produced for BBC Audio in Bristol by Heather Simons