The total number of the invasion force could be 250,000. Britain's special forces are said to be ready for a major role in sabotaging the factories which are suspected of making weapons of mass destruction. British and US agents have already been sent into the country to incite opposition groups into toppling the Iraqi leader. A senior Nato official in Brussels said the MoD was "mentally preparing for new challenges". Asked if these involved Iraq he snapped back: "Well, what do you think."