Matt Baker and Julia Bradbury head for Pembrokeshire in Wales for the annual fish festival. Matt finds out which fish you can eat with a clear conscience, and scours the seashore foraging for wild food. Julia joins the scientists monitoring the internationally-important bird colonies on Skomer Island, and discovers why the Pembrokeshire coastline spawned one of the UK's fastest growing extreme sports - coasteering. John Craven investigates whether the way we breed Holstein cows is creating animals that are nothing more than "milk machines", while Adam Henson takes a break from the farm and heads to the Three Counties Show to judge rare sheep breeds. Plus plant expert James Wong on how climate change is transforming what's grown in our countryside.