What is the nameof the main piece of legislation(act) under which nearlyall other health and safety regulation

The candidate showing alevel of knowlege and competence meeting the requirement of the national occupational standards
Answer
Believe it or not, it is still the 1974 health and safety at work act. there has been a huge amount of legislation since then but it is all designed in its own way to supplement the 1974 act by setting out what employers (mainly) need to do to comply with the 1974 act.