Prunes, Cherry Tomatoes, Growing Veg with Sea Water

Putting plums, prunes and prune juice to the test, Jimmy Doherty heads to King's College London to make a concoction that will help keep people's bowel movements regular. In Holland, Matt Tebbutt meets a Dutch pioneer who may have unlocked the secret to growing vegetables using sea water, which could change the lives of millions of people across the developing world, while Kate Quilton takes a close look at how much sugar is in cherry tomatoes, asking if the supermarkets are labelling them correctly.