Julia Bradbury and Matt Baker head for the Essex countryside to explore the landscape that inspired artist John Constable and to find about a natural approach to flood management. Matt's also in search of Britain's only venomous snake - the adder - while Julia meets the ex-prisoner who believes pig farming has saved her from a life of crime. John Craven investigates dire predictions that hundreds of our native animals are in danger of extinction while, down on Adam Henson's farm, the new arrivals are coming thick and fast - and it's not just lambs. Plus self-confessed map addict Jules Hudson heads to Loch Ness to find out if can chart a course as easily on water as on land.