Has the NICEIC guy signed the certificate that says the following:
I being the person responsible for the Design, Construction, Inspection & Testing of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the Design, Construction, Inspection & Testing, hereby CERTIFY that the said work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671…..?
If he has signed this then he has LIED, as he did not carry out the design and construction. Also, if he was not there to witness/supervise the installation then he will have been unable to inspect that the cable routes comply with BS7671.
The last I heard, NICEIC had opted NOT to be a part of the proposed "Third Party Certification" scheme.