personally I wouldn't be too upset if a protester nailed him in the head with a Red Stripe beer bottle and gave him a concussion that he doesn't wake from for a year or two but beyond that I have no thoughts in particular about the matter.
On a less serious note I figure this trip is all about delivering the news personally from bush that he can't give the UK all the reconstruction contracts that had been promised for their support and troups, because the country is going to be turned over to the iraqis sooner than planned.
Sort of a "yes, you risked your political career for me and will get absolutely nothing in return, but I thank you." speech from the heart of GW, followed up with a "Now can I count on you for support and troups in Iran too" query.