I don't have any particular comments to offer about the attempted car bombings in the UK over the past couple of days, other than to report the general feeling in those around me. There is certainly no hint of panic in most people. Everyone seems able to deal with the situation and move on with their day (although there may be grumbling about Tube delays).
Is this just the famed British stiff upper lip? I generally find the English reluctance to complain counterproductive, since it means that broken things tend not to get fixed, but cheerful indifference in the face of danger might be the safest attitude to take against terrorism. For a political theorist, it's often amazing that the UK has remained free with no written constitution to check government power; they do it with culture instead. The massive cultural momentum of thousands of years of painfully evolved tradition keep this country from drifting too far in any direction, a status quo that could never exist in America. (When the Framers convened in Philadelphia to draft the Constitution, they kicked things off by noting that Britain's constitutional monarchy was probably an ideal form of government, but that it would be impossible to replicate on fresh American soil--the Constitution was their idea of a second-best solution.)
As for me, I leave London tomorrow morning and am headed home.