Firstly, apologies for a typo in my original post - should have read 'Ancient Tracks' not 'Ancient Trackways' - have done a little edit (must have been slightly out-of-it on paracetamol).
Third and final episode about the North Downs Way, a well trodden part of the country but somewhere I have never walked. Interesting mix of prehistory at the start of the walk - a 3,000 year old production site of IA quern stones through more recent history, finishing at Down House home of Charles Darwin. Stopping off at the Medway Megaliths, the Whitehorse Stone and Kit's Coty on the way - not forgetting a visit to one of the oldest unpollarded oaks in the country. And more.
Loved it.
http://www.channel4.com/programmes/britains-ancient-tracks-with-tony-robinson