According to the Daily Telegraph, Britain's Security Service, MI5, "has identified approximately 2,000 individuals who pose a direct threat to national security and public safety and believes the number of potential terrorists living in this country (Britain) could run to 4,000."
Writing in the Telegraph, columnist Philip Johnston notes, "...it is difficult to prevent someone traveling to Pakistan ostensibly to visit their grandmother or uncle. An estimated 400,000 trips a year are made by Britons of Pakistani origin to their ancestral homeland."
What is needed in Britain -- and America -- is a change in the thinking that naively believes that simply exposing foreign nationals to our way of life means they will "catch" it as they might the flu. Allowing immigrants from nations in which the dominant religion mandates the forced subordination of every other faith (or no faith) and their subjugation through state power under Sharia law, increases the likelihood of more attacks.
At the very least, all non-Western immigrants to Britain and America should be told prior to their arrival that our intention is to westernize them. They must learn English, study and embrace the history of their host nation and, if they are Muslim, they will be allowed to worship only in existing mosques. No new ones should be built. Existing mosques must be monitored to make sure that hate is not taught and aggressive behavior toward their host countries is not promoted. If such behavior and speech are detected, the mosques should be closed and the imams arrested or deported.
Diplomacy should precede or follow war. Once war begins, victory is the only acceptable outcome. The goal of the terrorists is victory. If Britain and America settle for less, they will get less, which is defeat.