We have no idea

If we were completely aware of the true nature of the terrorist threat, we probably wouldn't sleep well at night.

Matthew d'Ancona reminds us:

On Boxing Day, Ken Livingstone told the BBC that there had been 10 attempted attacks on London since 9/11, two of them since the July 7 bombings. But the mayor insisted that these foiled atrocities were not the work of a "great organised international conspiracy with orders flowing down the chain", but of "fairly disorganised and small groups of disaffected people".

This is a serious misrepresentation of modern Islamist terror. What binds and inspires the cells that have plotted and continue to plot attacks on cities such as London is precisely the interconnectedness of the war: the thread that links the jihadi in the West Bank, or in Iraq, or in Afghanistan, with his brother in Leeds, or Lahore, or Los Angeles.