We've seen attacks focused in the past couple days on British targets.
I heard a radio report last night that a British Arab 'in the know', some kind imam I believe, was yesterday advising Muslims to avoid the London protests because something big was scheduled to explode.
Could this have been done as a little insurance, just in case, to 'remind' the Brits that we are in the crosshairs as well?
A successful attack in downtown London during Bush's visit might be one of the few ways to drive a wedge between the UK and US. The AQ-supporting int'l press would just love to lay that one on Bush's lap, and you know they would, probably with some limited success.