If 9-11 had happened in the UK, would Bush have backed Blair?

A really interesting question that has a bearing on the character of the ‘special relationship’: had ‘9-11′ (which I guess would have been dubbed ’11-9’ by us or else required elaborate translation for American audiences) happened on British soil and involving just as many casualties, how would the United States have reacted to it? I am not talking about the immediate outpouring of shock and sympathy but what followed – a declaration by the US of a ‘global war on terror’, the war in Afghanistan and, later, and more controversially, war on Iraq. Would President George W. Bush have backed to the hilt whatever course of action Prime Minister Tony Blair decided upon?