Master44,
I've lost count of the times, when I have turned up to a job, to find that all of the wiring is botched, and no-one wants to take the blame, in this situation, I would instantly call an Electrical Inspector, they have amazing powers of finding answers over here in NZ!.
Most of our Inspectors, are still employed by the PoCo, and the threat of refusal of supply, often works wonders.
A few times, I have come across a faulty installation after all of the walls have been lined and covered with expensive wall-paper, too, this doesn't tend to go down too well, when you try tell the home-owners that you may need to cut some parts of the walls,
to find the wires!.