John Craven visits the Severn Estuary to see how the incredible tides may be harnessed to produce green electricity. He also travels to the Flat Holm, just a stone's throw from the mainland but often totally isolated by the tides. Adam Henson is training with the horse he hopes will win him a long-distance endurance race across Exmoor. Miriam O'Reilly discovers the secrets of growing daffodils throughout the year. At the hundreth anniversary of the National Farmers' Union, Julie Morris investigates how successful the NFU has been in persuading us to subsidise farmers.