"I am no fan of George Bush but I am even less of a fan of those who war against civilians."

George Bush and Tony Blair have killed far more civilians than these terrorists ever have, including those of Septemnber 11th, let alone July 7th.

The military doctrine "Shock and Awe" is explicitly aimed at defeating and demoralising an enemy by means of an onslaght ionvolving high tech terrorism - a war against civilians. In the case of Iraq, in a country which, however unpleasant its regime, had at no time carried out any kind of military action against the USA or the UK, including the activities of Al Qaeda.

Seeking to justifying terrorism and atrocities by pointing at what the people you are fighting against might have done is one characteristic which is shared by the apologists of both sides. And, of course, by the people who actually carry out and direct the atrocities, whether on underground trains or in military command centres.
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I think that assuming that the bombers this week have any expectation of getting the UK to withdraw troops from Iraq is not reading their intentions correctly. I would think it more likely that those directing these activities would actually prefer to see the troops stay there, and continue to help strengthen the Al Qaeda ideology by their presence.

The other useful effect to be hoped for would be to generate discord between Muslims and non-Muslims on the streets of London and other cities, and to build support for groups like the BNP. Think in terms of chess, not football.