Battle of Britain duellists: Spitfire and Bf 109

Two of the fighter aircraft that epitomised the struggle in the skies over southern England in 1940, an RAF Supermarine Spitfire and a Luftwaffe Messerschmitt Bf 109, go head-to-head in a deadly encounter, leaving condensation trails at more than 20,000ft. Below, German bombers cross the Kent coast as a squadron of Hawker Hurricanes moves in to attack.