Excerpt:
In the UK, a lot of commentators -- not all of them Muslims -- said that the Islamic murder of Lee Rigby in Woolwich (London) was a primarily, or even exclusively, a response to three main factors: the Iraq War in 2003, the 'invasion' of Afghanistan in 2001, and, to a lesser degree, a response to the Muslims who have been killed by 'drone attacks' carried out by the United States.
Despite all of that, it has also been said that the move from selective terrorism to the "global jihad" occurred in London a couple of decades or so before the intervention in Afghanistan in 2001.
Osama bin Laden's first fatwas were originally published in London. And, as early as the late 1980s and early 1990s, a number of radical Islamist conferences took place in Britain.