The limitations of the Chilcot inquiry are obvious. It is a group of establishment trusties, evidence will not be on oath and the government is doing its best to keep key documents from the inquiry. Even yesterday, in the very first week of the inquiry, former British ambassador to Washington, Sir Christopher Meyer, mentioned four key documents that he knew existed but the Chilcot inquiry had not seen.
But despite everything, the truth is coming to light. One key revelation from Meyer's evidence is that Washington decided they wanted to invade Iraq and then scrabbled around for supporting evidence. As he put it: "The real problem, which I did draw several times to the attention of London, was that the contingency military timetable had been decided before the UN inspectors went in under Hans Blix." In other words, the inspections were a charade. The Americans were never much interested in the results. They had made up their minds.
http://www.guardian.co.uk/commentisfree/2009/nov/26/chilcot-inquiry-iraq-blair-goldsmith