I may have missed the point.. but.... doesn't this article need expanding urgently? I feel these types of articles should be expanded routinely (Grade I listed buildings).
http://en.wikipedia.org/wiki/Harmondsworth_Barn
In the news currently because English Heritage have just bought it.
Perhaps it should look more like this...
http://en.wikipedia.org/wiki/House_Mill
And, yes, I will edit the article - REAL SOON NOW.
Gordo