The situation is that the chair of the tribunal would ask for certain cases to be considered either by a claims officer or by a panel of one. A case may be heard by a claims officer who is not a retired judge but is someone who is used to dealing with claims for compensation. In the event that a victim is dissatisfied with the decision of the claims officer, there's an automatic right to appeal or to have a rehearing by a panel of one.
In the event that you have the claim heard by a panel of one, there is the possibility that the dissatisfied victim could make an appeal to a panel of three members.