How long is a piece of string?
Until someone grasps the nettle in CLG and actually decides on some kind of framework, similar perhaps to NEBOSH / IOSH system then only a court can decide what is or what is not acceptable.
Naturally you would hope that anything involving sleeping risks and hazardous processes would be assessed by someone who has done more than a 2.5 day course.
Its the age old thing that someone risk assessing a corner shop will only need basic knowledge, someone assessing a nuclear power station requires superior knowledge, and a lot of experience .
Also being competent is to know when you would be incompetent to take on something beyond your capabilities.
But as ever NT just like the question I asked about the competency of fire alarm engineers - it's teh generic "how long is a piece of string" answer form me , I'm afraid.