The only people who can hold Bliar to account is the House of Commons. Not a realistic proposition is it. Just like the Crown Prosecution Service verdict of not having a realistic probility of conviction.
Would anybody expect turkeys to vote for Christmas, no didn't think so.
One day the War Crimes tribunal in the Hague may charge him with war crimes, something on the lines of Waging Agressive War as happened at Nurmeberg in 1945-6.