Will the Conservatives join the progressive alliance against corruption?

Simple question: Nick Clegg has repeated Lib Dem calls for an inquiry into the scrapping of an anti-corruption investigation into the Saudi arms deal following revelations that Blair wrote a “who will rid me of this turbulent priest?“-style letter to the Attorney General on the eve of the investigation being dropped. Will David Cameron join this progressive alliance, or not?

Since we are apparently all progressives now, this is surely a no brainer? A basic fundamental tenet of progressivism is the idea of equality under the law, with no exceptions for special status. Who could argue against such a thing?

It is a simple question that demands a simple answer. Perhaps my Tory readers would care to try answering it.