I think that the naming of the ac is interesting here. It was de Havilland Biplane No 2 as first flown until purchased by the War Office for 400 quid who renamed it Farman Experimental 1 (FE1). This was not a series built aircraft but a unique one off (FF 10 Sept 1910, BER 15 Aug 1911) engine being a de Havilland Iris.