Safeware
I agree -re top down. I just expressed the hope they reached the equipment level. Routinely maintaining the build standard of equipment (which includes safety) was ditched as a policy in around 1991. I worry there is insufficient funding and experience to resurrect these build standards - in which case the 3 levels you describe are immediately compromised, as there is no seamless audit trail.
This is entirely relevant to, for example, Mull.