I'm British and used to work in London, so the recent bombing incident brings back memories of similar events in the past. The IRA would often leave bombs during Christmas in places like the restroom in Harrods in order to kill a few innocent tourists and create unease. However, as many people have noticed, the British are used to this kind of thing and it has very little effect except to bolster our resolve and temporarily increases sales of tea.
One blogger describes the British as brave, unflappable and open-minded. I think this is generally true. In addition, I've noticed that the British will tend to look for the humor in almost any tense situation; victims in train wrecks have been known to crack sick jokes about their own predicament whilst waiting for help. For example, here's a quote from someone who lived through the World War II blitz and was caught up in the recent Canary Wharf explosion:
"I've been blown up by a better class of bastard than this!"
That is just classic! Click here for some similar stories.