You are in a hangar on the farm where the four prototype de Havilland Mosquito aircraft were built in 1941 in great secrecy lest the Germans should get wind of this fast fighter-bomber.  The yellow fuselage is what remains of one of the four original prototypes.

The hangar, situated just five or six miles from Hatfield in Hertfordshire which was the home of de Havillands, is currently a museum not just for the Mosquito but many other de Havilland aircraft, both military and civil.  More about the museum at

http://www.dehavillandmuseum.co.uk/index.html