"This Norwich Yard is approached through a very narrow entrance and has a labyrinth of passages and openings leading from it. On the wall of the house opposite the pump from which the water supply is derived there were marks of an accumulation of filth two feet high. At the time of the visit there was refuse and decaying matter around the pump and dirty water standing about round the drain, in at least half a dozen places . . . In the middle of the passage was a drain blocked with refuse……"