I'll address the last aspect of your question first. I think this comes back to the question of parliamentary accountability, in the sense that one remedy for the Attorney General who finds himself or herself in that position is to seek to describe that circumstance in Parliament.
However, in the context in which this is all happening with respect to a decision to prosecute or not to prosecute the challenge is, I think, that most people in the position of Attorney General or DPP would need to wait until a matter had been concluded, so they were not influencing the procedure of the matter going through the criminal justice process before they would speak on those issues.