A man who helped to make the case for invading Iraq – starting a nine-year war costing more than 100,000 lives and hundreds of billions of pounds – will come clean in his first British television interview tomorrow. "Curveball", the Iraqi defector who fabricated claims about Iraq's weapons of mass destruction, smiles as he confirms how he made the whole thing up. When it is put to him, "We went to war in Iraq on a lie. And that lie was your lie", Rafid Ahmed Alwan al-Janabi simply replies: "Yes." His lies were presented as "facts and conclusions based on solid intelligence" by Colin Powell when making the case for war at the UN Security Council in February 2003, after US officials "sexed up" Mr Janabi's drawings of mobile biological weapons labs, admits General Powell's former chief of staff. Mr. Janabi tries to defend his actions: "My main purpose was to topple the tyrant in Iraq."