Yes. . .but Fur was asking rhetorically if we would have done so without political support, not military support.
Of course, militarily, we would be just fine without coalition forces.
(Although I believe we could have done it politically alone as well. I'm not sure how much more political support we've gotten because of GB. It's more likely that Blair has just gotten more flak because he supported us, not that his support has helped us.........politically speaking, that is).