Ellie Harrison and John Craven are in North Pembrokeshire, visiting the Gwaun Valley and Preseli Hills. Ellie delves into the distant past, discovering a landscape full of Iron Age treasures. John helps to give an ancient forest a new lease of life before sampling the local homebrew. Tom Heap is in the north of England, investigating claims that our uplands are in crisis and that farming is partly to blame. And Adam Henson is having a tough start to the new year on his farm, with some devastating news about one of his favourite animals.