Notable British fighter aircrft in WW2 include the Supermarine Spitfire & the Hawker Hurricane. The Boulton-Paul Defiant was a novel attempt to mount a four machine gun turret ito a fighter, but was unsuccessful in daylight flight. The Hawker Typhoon was a very good fighter bomber later in the war.
The two major British fighter planes were the Hurricane and the Spitfire. The primary type was fighter. Some aircraft were used for rescue of downed airmen at sea and for coastal patrols. These varied from seaplanes to two-engine bombers.
Cecil Frederick Rawnsley has written: 'Night fighter' -- subject(s): Aerial operations, British, British Aerial operations, Fighter planes, Great Britain, Great Britain. Royal Air Force, World War, 1939-1945
"Spitfires" were the main "fighter" planes. "Hurricanes" were important too, particularly during the "Battle of Britain". There were several other fighter planes too. There were also several types of "bombers" and other planes.
They are not intended as targets. They are national markings to identify what country a fighter plane belongs to, although many of them looked like targets, and they may have been used as such by enemy fighter planes in close combat.