Terrorism Bill

I understand that it is widely alleged that the 7 July bombers were under some sort of surveillance and that there is enough evidence to suggest that they could have been charged with raising money for terrorism or other offences. Does the hon. Gentleman agree that, if that is the case, we must have a thorough inquiry to learn the lessons? If it is true that we could have prevented what happened, looking further into what happened on 7 July might lead us to some answers regarding what we are debating today.