Please get real. Do you honestly believe that UK forces will be pulled out of either Afghanistan or Iraq as a direct result of this attack? Not a chance in hell. Why do you think this to be the case? We lost hundreds of UK citizens during 9/11. Nothing is going to change in our support for the war on terror as a result of this atrocity. The IRA couldn't do it and neither will these scum!
I'd agree with that. The reaction I'm seeing seems to be a quiet determination not to be intimidated or otherwise influenced by this.
We all knew this was going to happen when we signed up for Iraq. Some British people think the price of supporting the US was worth it and others don't. I don't think either group is likely to change their minds over this.