Definitely not a Lancaster tail wheel. I still think it's a main wheel, and what looks like a brake line is visible there too. I also think it's American, judging by the design of the wheel hub.
I originally thought that the nose was out of shot, to the right, but I'm now thinking it may be the other way around. The wheel, and the shape of the structure in the foreground, seem familiar, but I can't place them - yet.