Anna Hill finds asks why some countries impose export restrictions on agricultural products, and finds out how political decisions affect the global food crisis. A drought could be declared for parts of Eastern and Central England, where farmers are struggling with a lack of rain. We hear from an estate manager who explains how this is affecting the harvest of some root vegetables. Staff shortages are a big problem in many farming sectors. We visit a vineyard in East Sussex, where they've managed to recruit pickers who live within a 15 miles radius of the farm. Presented by Anna Hill and produced by Emma Campbell.