Matt Baker and Julia Bradbury head for the Brighton Downs in Sussex to find out about the rise of urban shepherds, why water voles are making a comeback and to mark the 150th anniversary of Brighton's Outdoor Swimming Club - an unseasonal dip in the briny. John Craven meets rural campaigners fighting against the invasion of supermarkets but are they local heroes or villains standing in the way of progress? Jules Hudson discovers how you can experience the thrills of off-roading without carving up the countryside. Plus, the new arrivals are coming thick and fast down on Adam Henson's farm but not all sheep are natural mothers as he discovers.