And There We Went....

I examined the wiring. It is possible that the wire was never connected in the first place.
Trouble with a lot of these dick-wad electricians is they use all sorts of wire to do the job.
The main cable is right, but the Earth was ported to a RED wire(the loose one). The power is in a Brown wire with a Black neutral, which hasn't been code for thirty years.
The unit was never earthed, but the probable cause is the Cell back-up going flat.

So I'll replace it in the morning.

Let's hope nothing unlucky happens eh?

By the way, I've edited the source code so the 'blog loads properly on Firefox.