Vortigern
Arms
To be fair to NICEIC, of whom I have no liking, they inspect a qualified supervisor and inspect the company rather than the individuals in the company. There is no doubt in this scenario a rogue or two will get into the system and get away (for a certain time) with mayhem. As @Wilko says this is not the "norm" I think NICEIC have the right idea in making sure the work is, in the end, safe and compliant. No doubt the firm you had working for you will send someone who knows what they are doing. Optimistic I know but generally speaking I think I can safely say the many electricians on here would never do such work. It is as always a minority that spoils it and tars the whole lot. Try not to let this happen. I can see the steam coming out of your vents from here, and quite rightly. In the case of negligence there are three hurdles to jump. One, Is there a duty of care, Two, was that care breached, Three, did harm result from it? Clearly there is a duty, and it was breached. The "harm" arising is loss of money and potential danger in an electrical situation. The remedy? Fix the poor work. You have been offered a means of addressing this and have refused to take it. If you will not take the necessary steps to mitigating your losses then you have no recourse to law in the matter.