I'm starting to see the angle that you are coming from, but I don't really agree with it on the whole
If the main equipotential bonds were sized according to the 15th, and the certificate claimed compliance with the 16th, then it might indicate that the installer was ignorant of the standard to which he was supposedly installing to, and you ought to be on the watch out for other departures of a similar nature.
Exactly!!
In addition, you could also report the failure of the initial inspection and testing to pick up this deviation and thus the fact that the certification claims compliance with a standard when there was no such compliance (that would be instead of the usual one about there being no certification for the original installion then ) however this would a minor point in the grand sheme of things
I don't see it as my responsibility to report such things, unless specifically instructed (and paid) to do so by clients. It's very easy to nit-pick long afer the event and I've never been in favour of 'witch hunts'. I'm sure that the next few months will see a few things slipping through the net at the hands of some very competent electricians. Perhaps due to pressure, simple error etc. Code 1's might be different, especially those of the kind highlighted in recent prosecutions. Or perhaps numerous Code 2s for example.