Next Target:

Ayman al-Zawahiri, bin Ladin's deputy.

While there is a lot of press about possible retaliation attacks, it is worth keeping in mind that al Qaeda has been severely degraded since 2001. They don't have the capability to pull off big, massive plots.

Meanwhile, if you are in the UK, you're undoubtedly safe because the fuzz have been keeping tabs on those dastardly elderly extremists.