Paul Whitewick takes us from Ivinghoe Beacon in the Chilterns to Wiltshire. There we see Liddington Castle, which was sacred to Richard Jefferies, and then some of our sexiest prehistoric monuments, if Avebury and Silbury Hill will forgive me for calling them that.

How old is the Ridgeway? Is it really one path at all? Long walks are good for pondering such questions.