I'm not familiar with the "registered third-party certifier" arrangement. But if the inspection is being done as a BS7671 inspection, I can't see it would make any difference. The inspection is done according to the current vesion of BS7671, so no RCD on the cables clearly is not in compliance with that current standard. But as I see it, it shouldn't make any difference to the code given just because the person carrying out the inspection knows that it was only just installed.As a matter of interest, what would you feel in the case of a "registered third-party-certifier' (there apparently now are a few!) who was, as required, undertaking an EICR within 5 days of completion of work that (s)he had been supervising? In that case, there would be no doubt that the work was 'new work' - and I can but presume that the work would 'fail' the inspection, such that (s)he would not issue a Compliance Certificate, if the work was not BS7671-compliant.
How so? If the current version of BS7671 requires RCD protection and you don't provide it, surely you need to note that as a departure on the certificate? (Unless one wishes to specify that it complies, specifically, with BS7671:2001 instead of BS7671:2008 or some such thing.)That can certainly be argued. However, it doesn't alter the fact that, with the regs as they are, someone could honestly sign the declaration on an EIC or MWC for such 'new work' without documenting the deviation