Tom Holland and Iszi Lawrence consider fascinating and multi-faceted aspects of history.

The new series of this long-running programme focuses on lines - historical and historic lines and routes that may be physical or conceptual and that criss-cross our geographical and cultural landscape. It looks at why and how they came about and discusses what they offer us in our understanding of our past and present.

Programme 1. The Prime Meridian - the journey from Stonehenge to Jazz As it's New Year's Day, it seems the perfect opportunity to explore the history of the Prime Meridian at Greenwich and our relationship with Time. We start at Stonehenge and finish at the National Jazz Archive, located on the meridian at Loughton in Essex. Along the way, Tom and Iszi take in the Romans, French-Anglo rivalry and which animals can hear a beat.

Tom Holland is a writer and historian who has written a number of popular and successful works including Dynasty and Rubicon.

Iszi Lawrence is a comedian and broadcaster who's appeared on Making History as a guest but is now the new co-presenter.

Producer: Alison Vernon-Smith A Pier production for BBC Radio 4