The physical defence of London was crucial, and a ring of steel and concrete was thrown up around the capital as well as utilising natural defences – such as Box Hill in Surrey.

RAF Kenley is one of the most intact Battle of Britain airfields. What really gave Britain the edge during World War II was a secret weapon – an integrated defence system and RADAR. The first radar was developed pre-war in Bawdsey Manor and developed further from a 16th century pub in Purbeck, becoming fully operational from bases such as Great Baddow.