Although I am able to do third party sign off with Stroma...I got involved in second fix and testing on an extension and it turned out to be a nightmare. I think the bottom line is if I haven't done the first fix or personally supervised it, don't do that ever again! Quite a bit of two way switching, in the lounge (30 sq. m) and the builders had forgot to cut out box for switch on two two way strappers and switch wire had to fit box and fish them out of rockwool. Supply taken from switched rose in lounge to the next room. New supply cable had to be put in they had to lift part of the roof to get the cable in. Wrong switch wire in kitchen/dining room (should have been in lounge on two way switching again!) It was a nightmare sorting it out and figuring out what was going wrong and putting it right YOU CAN BE PROFESSIONAL UPTO THIS POINT ITS THE NEXT BITwhile the builders were suggesting it was my fault. Never again. If I am not in at the beginning forget it.
Oh yes and in the bathroom five cables in two places supposed to be going into lights (no way) had to cut hole in ceiling and wago them and drop down one cable and so on!