The head of MI5 says that there are at least 2,000 people in the UK who pose a threat to national security because of their support for terrorism. Blimey. Some would advocate locking them up or deporting them. But we're a civilised country, with laws and way of doing things. And these people may be suspected but they've not, generally, been convicted.

Our freedom comes at a price. But I know that some people are questioning whether that price is too high.