In the summer sky over rural Dorset, a swirling air battle rages. Supermarine Spitfires and Hawker Hurricanes vie for control of the air with Messerschmitt Me 109s, while Stuka dive-bombers plunge earthward, sirens screeching, to attack shipping off the coast. There’s a momentary miscalculation – and a Hurricane collides with a 109, slicing it in half. The stricken fighters spiral to the ground as above them RAF and Luftwaffe pilots, twisting and turning in a desperate mass dogfight, battle on regardless. This is the Battle of Britain, fought not in 1940 but in the present day – and at a...