Update. What did I tell you? Prime Minister Gordon Brown has told the man heading up an independent inquiry into Iraq that he can decide to hold public sessions if he chooses. Students of public inquiries will marvel how the right kind of pressure can produce results. One of the grandest of grandees, Lord Butler of Brockwell, Cabinet Secretary when Tony Blair came to power, looks like forcing a U turn in double quick time over Gordon Browns controversial decision to hold an entirely closed inquiry into the Iraq war. To drive his point home, hes even given the BBCs Nick Robinson a few extracts of a speech hes due to make in the Lords this afternoon. Butler, who held an inquiry in 2004 into the quality of intelligence that led to the invasion, is planning to make the deadly accusation that the government is “putting its political interests ahead of the national interest.” Its hardly possible to make a stronger charge, particularly coming from a mandarins mandarin.Lord Butler believes that the inquiry, to be chaired by one of those who sat on his inquiry – senior civil servant Sir John Chilcot – must do more than “learn the lessons” from the war. There must, he will say, be a “truth and reconciliation” element to it as well. And wait for it our own Lord Hutton is supporting Butlers call. To be fair to the retired law lord, his inquiry into the death of weapons analyst David Kelly blazed a trail by publishing a whole raft of revealing documents on its website. These days, inquiries are at least as important for the information they publish as for the verdicts they pass. Will Brown U turn in time to spike Butlers guns? Watch for news from this mornings lobby to find out. Does full disclosure promote “truth and reconciliation” or harm it? That’s the familiar conundrum at the heart of the government’s fears of a public airing – as far as it affects their own reputation.