I don't have a straightforward answer for you.
I should tell you that I ended my report to the government on this issue by underscoring the importance of the quality of the people they appoint. I don't have a model in mind, but I would say that an indolent, too-relaxed chairman would not be helpful. It could be somebody who takes this seriously or perhaps has a background in law or law enforcement, but not necessarily. A member of the public could do this very well. In any case, I think the quality of the people is hugely important.