If there has never been a previous EICR issued on the install, is that a problem? It might be hard to pinpoint when exactly the work was done originally. I know when approximately it was done but there is no documentation to state this.
That’s where experienced, well trained electricians come in.
Initial verification and testing on a new job is all very well, but to produce a good EICR, the electrician needs to be able to age an installation… sometimes through the equipment in use, types of cable in use, general age of the building.. etc.
it doesn’t even have to be accurate. 20 year old, it’s possibly fine. 30, there could be age related wear and tear… 40…. 50?
TBH, there could be a 5 year old installation that has more problems and more serious problems than a 30 year old one done properly at the time.
The coding of a C1, or C2 has never changed. It’s either dangerous, or potentially dangerous.
A C3 is actually harder to identify, and I believe ROI has a “not to current regs” code as well. (Am I right there?)
C3 is classed as “improvement recommended” There is nothing there to demand it has to be brought up to date.