^ You are absolutely correct to insist that electrical work is done properly.
Our house is 5 years old and the kitchen has developed a fault.
There's about 18 sockets on one breaker.
The wiring has shorted. The wiring of course is embedded in the wall so tiling and rendering will have to come off to fix it properly.
I have just moved my Computer down to the groundfloor room and now find that none of the GF sockets have an earth.
Chang Fai Fa is not a popular word with me