Charlotte Smith explores Prince Charles' interest in biodiversity, drawing on editions of On Your Farm recorded with him in 2015 at his summer holiday farm house in Romania's Transylvania. And she hears about the organic farming methods used at his Duchy Home Farm at Highgrove in Gloucestershire.

Mining the rich archive of past editions of the long running series On Your Farm shows how much the farming industry changed across the 20th century. The series, which began in 1965, has visited every possible kind of farm around the British Isles and beyond.

Producer: Mark Smalley. Show less