I think there is one constant in all the presentations. The word “supervisor” must absolutely be removed and replaced with “designated person”. The regulations could then suggest possible definitions. We want a range of possibilities, not just one.
For the House of Commons, the “designated person” might be someone who is designated as they are by bar associations, that is, an eminent person who conducts confidential investigations. In a small company, it could be an outside party. In any case, we must provide for multiple potential procedures, and not just one. Directing the person to their supervisor is really not a good idea.