Despite being a relatively large two seater the Bristol Fighter was still competitive against single seater opponents in World War I. It was faster and more maneuverable than many would have assumed and it remained in service right up to the 1930s.
The forward facing 303 Vickers machine gun was the main weapon but the rear facing 303 Lewis Gun operated by the observer could act as a "sting in the tail" which the smaller fighters lacked. Some models even had two guns in the observer's cockpit.
In the mock dogfight which the "Brisfit" was involved in at the show it looks like the little Fokker D8 is on its tail and has the advantage this time!
Bristol Fighter Specs:
Sources: Wikipedia, Warbirds Over Wanaka 2012 Programme.