Thank you for the kind words. I thought this thread had died a death as not many people are interested in toilet blocks. 
I think this one is interesting!
And Deothar's comments had me thinking about in game rules. Perhaps living human characters should have to pass a will test before they can enter due to the stench? Undead would be immune, of course. Olfactomancers, on the other hand (with their heightened sensitiviy to such things) would suffer a -4 penalty to their roll.
I also imagine that over the centuries methane that will have built up in the roof space. As a result any figure holding a flamming torch that enters or activates inside the block must first roll a D20 and on a 16 or more there is an explosion resulting on a +3 shooting attach to every figure within the block.
If a mischievous (not to mention downright unhygienic) player were to place a treasure inside one of the toilets then surely any living human would have to pass a further will roll to actually retrieve it (I am thinking of that scene in Trainspotting where Renton has to dive into the "Worst Toilet in Scotland" to retrieve his suppository).
Assuming the treasure hunter is successful and that they make it back to base they must then roll post game to find out if they remembered to wash their hands properly afterwards. A failed roll would mean missing the next game while suffering with something unpleasant.
What do you think?