I think the Cenex report certain seems to confirm that thinking even from the small sample audited.
Given that about 5% of all the installations carried out were audited if the results are taken as a representative sample then there could be quite a number of installs just under this grant scheme that are not correctly or dangerously installed
With the number of none compliant installations found it does prompt the question of what level training some of the installers had even in basic electrical installation
I looked into some manufacturer's EV point training a while ago, Rolec have partnered with the NICEIC for training and push you to a one day NICEIC training course costing £185 + vat with a £20 discount if your a member of the NIC, so it looks like you get a generic course although the actual syllabus of the course isn't very clear in what components of the installation of EV points it covers
Been on a few sites over the last 6 - 9 months where EV points have been installed and everyone has been installed differently with most of them not complying with the regs on minor points if you call issues with the installation of the TT earth rod / earth lead minor