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We noticed recently that a couple of the wall switches to the lights give an electrical sensation when touched. Is this due to poor earthing, cables, or connections on the light circuit? :?:

The lighting circuit has seperate phase and neutral cables. Colour coded Red and black with own cpc. The neutral is wired from ceiling rose to ceiling rose, one to the next. The phase is wired from wall switch to wall switch in the same fashion with the switched phase running to the ceiling...

The valve started dripping about 2 months ago from a small hole at the rear of the diaphragm housing. I guess the diaphragm has been breached? I noticed a flat mark on the base of the valve which is otherwise round (housing the diaphragm) and looks like it could have been damage caused during...