Hedgerow havens

Hedges are such a traditional part of the British landscape that most of us don't give them a second thought. They're usually associated with the enclosures of the 17th-19th centuries, when the medieval farming system gave way to enclosed fields surrounded by hedges - designed to keep sheep in and people out. But, as Martha Kearney finds out, many hedges are far older than that - going back thousands of years in some cases. In this programme, Martha explores the history and future of the hedge. She learns that there are an estimated 400,000 miles of hedgerow...