Matt and Ellie are in Northumberland, where Matt finds out how the rock cliffs of the Whin Sill gave rise to some very rare grassland. He also discovers that Hadrian's Wall is one of the last strongholds of one of the UK's rarest plants. He then dons full Roman regalia and learns that most of what we know about Roman armour comes from a world famous discovery at Hadrian's Wall 50 years ago. Ellie is with the amateur astronomers enjoying the best dark skies in England and learns about the different ways you can photograph stars. She also visits Allen Banks - the famous gardens laid out by Victorian superwoman Susan Davidson - and joins in the effort to restore their renowned picturesque viewpoints. Adam's in the market for a rare breed Portland ram, and former farmer and trained butcher Gareth Barlow looks at the British beef industry. Tom Heap investigates the impact that falling milk prices are having on British dairy farmers.