I suppose you'd describe it as a vertical soil stack although it is only
about 3 feet above ground and 18 inches below. The toilet outlet comes
through the wall and straight into the stack and the outlet from the washing
machines comes out along the wall to the right and enters the stack at the
same height as the loo but at an angle of 90 degrees from it. The
shower/handbasin outlet on the other hand comes out further along the wall
to the left (and lower because the room is a wet room and therfeore the
shower outlet is below floor level) and drops down so that it enters the
stack about 2 feet lower than the other two. As I said in the original
post the short stack is capped, not vented.
Here is a pic http://tinypic.com/r/709po6/3
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