Matt Baker and Julia Bradbury head to the Chilterns in south-east England to mark the 20th anniversary of the reintroduction of red kites. The hills are now home to 600 pairs, but an unfortunate few find their way to the local wildlife hospital, where two rehabilitated birds are now ready to be released back into the wild. Elsewhere, John Craven wages a war against waste, and investigates why millions of tons of food, rotting away in our landfill sites, could be used to power our homes instead. Down on the farm, Adam Henson gets to grips with sheep-shearing, plus the marine conservation officer on a mission to find out why the UK's harbour seals are dying in worrying numbers.