Archaeologists Tony Pollard and Neil Oliver carry out detailed studies of British battlegrounds, beginning with a visit to Essex to uncover the lost site of RAF Hornchurch, an airbase that played a crucial role in the Battle of Britain. The intrepid pair chronicle the story of the aerial conflict between the Luftwaffe and the RAF, unearth precious finds from the period, talk to veterans of World War Two and trace the whereabouts of a Spitfire which flew out of Hornchurch during the battle. .