This week, Ranvir and Alex explore the secrets of Highclere Castle, the home of Downton Abbey.

We also visit an orchard in Somerset to hear from the Thatcher family about the business of brewing cider, and head to the north east coast to find out about the past and present of Holy Island oysters.

Ranvir and Alex train to become knights at Warwick Castle. Plus, we meet the walking group in Yorkshire that's on a mission to prove that nature is for everyone.