@ AC
'how would you feel if the law hadn't passed and some "brainwashed" fundamentalist came along and blew up your office / town centre and killed innocent people and it emerged that hmm we could have gotten him if we had more time, we kept working and proved it but too late to prevent this...'
Think about the recent Exeter bombing - the brain-washed bomber who had learning disabilities and his handlers were known to the security services, almost certainly through communications intercepts. If this evidence was admissible in court, they would have been arrested, charged and imprisoned before his failed attempt. How would you feel if he had succeeded? Detention without charge would not have prevented the bombing.
The security services claim there are hundreds of people plotting to attack us. They can only know this through intelligence - spies and intercept evidence. Our security depends on subjecting them to due process of law before they blow us up, not 42 day detention without charge.
42 days is about Brown politically posturing and nothing to do with our security.