Dr Mike Parker Pearson of the UCL Institute of Archaeology will reveal the latest theories about Stonehenge, one of Britain's most enduringly fascinating historic sites. There has been major work ongoing at Stonehenge since 2003, which has uncovered new informaetiona about the dates it was built, the stone ring's purpose and its context within the surrounding 'ritual landscape'. There's no need to book - just turn up and expect seats to be arranged first-come, first-served.