I did wonder why there are mushrooms growing underneath the bath and what the source of the constant damp patch in the hall closet was. The smell of effluent which regularily wafted from the bathroom (for which poor Alpha has often been blamed) is now explained.
But I am finding it hard to accept that the collective poo of the many residents in the building has been seeping in to our apartment for such a long time; at best a Feng Shui nightmare, at worst a health hazard.
The joys of living with dodgy London plumbing. Shit really does happen.