With your plan you are not going to get one.
You may get something from the council to say that it complies with the Building Regulations, since those do not mandate compliance with the Wiring Regulations, but you won't have anything to show that the work complied with the latter.
You may get something from the council to say that it complies with the Building Regulations, since those do not mandate compliance with the Wiring Regulations, but you won't have anything to show that the work complied with the latter.