Matt Baker - Grand Union Canal

Matt Baker explores the stretch of the Grand Union Canal that runs close to his home in the Chilterns - meeting those who live and work on the waterway and also getting to grips with an engineering marvel that keeps the whole system flowing. Elsewhere, Tom Heap investigates how farmers are adjusting to the challenges posed by climate change, and John Craven launches this year's Countryfile photography competition with the help of singer and broadcaster Cerys Matthews and wildlife expert Simon King.