It's become that so someone has to put their name saying they insected the item. The decent electricians would have carried out the inspections as BS7671 and would not have to be instructed to do so.The full NIC certificates are a nightmare, page after page after page of pointless tick boxes. I don't mind the minor works one, at least it is still one page.
We use a 5 circuit minor works when there is more than one circuit.I think NAPIT do a three circuit minor works certificate.