 In the interwar years, Hawker produced a successful line of bombers and fighters for the Royal Air Force, the product of Sydney Camm (later Sir Sydney) and his team.These included the Hawker Hind and the Hawker Hart, which became the most produced UK aeroplane in the years before the Second World War.During the Second World War, the Hawker Siddeley company was one of the United Kingdom's most important aviation concerns, producing numerous designs including the famous Hawker Hurricane fighter plane that, along with the Supermarine Spitfire, was instrumental in winning the Battle of Britain.