So why mention the relatives when I had already said they were an interested party by referring to them as prosecution witnesses?
I doubt anyone needs to worry much. I suspect the caseworkers understand he is innocent, from some, if not all evidence placed in front of them, and from previous communication. However, as you have pointed out, their hands may be tied, politically - which is why legalese nonsense is used to prevent referral. They can't refer because the crown would be unable to contest the case at its current stage. With masses of non-disclosure still in place (ie 2002), the crown could defend. It can't now. Therefore they have to find a way to refuse.