The Jamestown Foundation, which does some of the best analyses of jihadism, put out a report last year about how Britain's lax asylum laws have helped make it a home-away-from-home for many Islamic militants.
This kind of argument can easily morph into racism or xenophobia. But the Jamestown folks. are serious analysts not 'immigration reformers' looking to score cheap points. And despite the queasiness connected to the conclusions they might also be accurate. They're at least worth a read:
You could say that London has become, for the exponents of radical Islam, the most important city in the Middle East. A framework of lenient asylum laws has allowed the development of the largest and most overt concentration of Islamist political activists since Taliban-ruled Afghanistan. Just ask the French, whose exasperation with the indulgent toleration afforded to Algerian Islamic activists led them to dub the city dismissively as “l’antechambre de l’Afghanistan.”
They certainly have a point. Many of Bin Laden’s fatwas were actually first publicized in London. In fact, the United Kingdom in general seems to differ from other European states in the degree to which it became a spiritual and communications hub for the jihad movement. As such, it can furnish the indefatigable researcher a wealth of primary source material on Islamic terrorism.
The refuge the United Kingdom offers Islamist opposition is little short of bizarre. What appears to have happened is that the country’s asylum laws were designed to protect only dissidents and refugees from foreign governments. Victims of other persecutions, such as sectarian or ethnic struggles, fall through the net. The result of this is that, for the Middle Eastern refugee population, a proportion of them can claim asylum specifically on the basis of their Islamist political opinion and activity.
[...]
The latitude granted by British law to activities other countries would find impermissible has bred a stock of legally savvy Islamists who know how to express themselves as provocatively as possible but just staying a whisker within the law. Anjam Choudry, the chairman of al-Muhajiroun is a lawyer himself, and another master of the art is the Syrian born radical Islamist and veteran of the 1982 Muslim Brotherhood uprising, Sheikh Omar bin Bakri Muhammad, a founder of Hizb al-Tahrir and co-founder of al-Muhajiroun. By the time of the 9/11 attacks, Bakri had long presented himself as the spokesman of Osama bin Laden’s International Islamic Front for Jihad Against Jews and Crusaders, and funder of Hamas and the Palestinian Islamic Jihad. But he came to notoriety as far back as 1991 and the first Gulf War when he claimed that the then UK Prime Minister, John Major, was “a legitimate target; if anyone gets the opportunity to assassinate him, I don’t think they should save it. It is our Islamic duty and we will celebrate his death,” [3] a point which he later clarified as “a legitimate target if he were to set foot in a Muslim country.”
The contradiction with reality is somewhat startling, as Sheikh Bakri acknowledged to the press that he had been living on social benefits from the British government of “nearly £300 a week in state handouts for himself, his wife, and their five (as of 1996) children.” He explained it thus: “Islam allows me to take the benefit the system offers. I’m fully eligible. It is very difficult for me to get a job. Anyway, most of the leadership of the Islamic movement is on [state] benefit.”
I don't know that the analysis is right--maybe it has the facts all screwed up. But it's worth finding out more about...