>>If your electrician isn't certified then a third party certifier has to certify the work after completion.
Even that has been outlawed sadly. You can't fit your own fuse board and get an electrician to just sign off on it anymore - there might be people who still do it and give you a document saying they've done the installation, but in general it's not a thing anymore.
Of course absolutely nothing stops you from doing it anyway, then having a general electrical inspection done. If anyone asks just say it was like that when you bought the house already.
Even that has been outlawed sadly. You can't fit your own fuse board and get an electrician to just sign off on it anymore - there might be people who still do it and give you a document saying they've done the installation, but in general it's not a thing anymore.
Of course absolutely nothing stops you from doing it anyway, then having a general electrical inspection done. If anyone asks just say it was like that when you bought the house already.