Okay, so the "electrician" that fitted that is a complete numpty. There's plenty wrong with what he did.
BUT there is NOTHING wrong with that consumer unit.
I would have disconnected the whole lot, then re connected it properly, correcting all the mistakes and faults with the wiring as you go, and labelled it all properrly. there was NO NEED to rip that new board off the wall and bin it.
And then, since you HAD re connected the whole CU, I woudl have no difficulty in certifying it just as you did with the new one. You would have connected and tested everything, the only thing you hadn't done was physically screw the CU to the wall.
That's all I am getting at, is why bin a perfectly good CU and charge the customer more money that is not needed?
I shall say it one last time and hopefully it will then sink in. I will try and say it in the easiest to understand way possible.
The customer wanted me to fit a metal consumer unit.
It had nothing to do with any form of fire resistance and I really don't know why anyone thought it did. I have not once mentioned on this thread that it was fitted due to its fire resistance. They chose the metal CU due to the fact it is located in a passage way through the garage and believed it would stand up to getting knocked better than a plastic one.
Maybe you can all stand down off of your high horses now and concentrate on your own lives.