Cameron to act?
I would hate to dampen hopes but you really do need to read what Cameron says in his letter very carefully. The key words are "in the absence of any overwhelming argument presented to me".
I cannot recall one Minister, or Prime Minister, of either party who was prepared to do other than stand by the findings of the BOI and Reviewing Officers when presented with the appropriate briefing.
It is very easy to say one thing in opposition, it is an entirely different ball game when in government. It won't happen.