There is no physical connection between Iraq and the London bombings. No Iraqi nationals with Iraqi passports are even being reported as having been detained. Leftist however will have no problems believing that this mythical connection actually exists. Yet historically they denied a connection between the 911 US attacks and Iraq.
The facts seem to point to a connection in the style of attack and the Spain bombings. In both cases these terrorists were not completely suicidal. Some of them apparently did not want their virgins. These could lead one to mythically concieve that terrorists (historically referred to as barbarians) located closer to the anarchist side of the Unholy Alliance were responsable.
There is however the possibility that we are winning the war on terrorism and our enemy can no longer afford to sacrifice what few soilders it can muster.