Investigatory Powers Bill

My Lords, I absolutely understand the motivation behind the amendment, but I wonder whether the Minister might consider another objection. He referred to the risk of the person who was notified changing his practices in the knowledge that what he was doing was being observed by one or other of these various methods. The problem may be not the individual himself but the people with whom he is in contact. One does not know how wide the web is of the group to which he belongs, and it would be so easy for that message to be passed around to people to warn them that there is a particular mechanism in play which is tapping into what he does and that those who operate in the same way as he does will be subjected to the same kind of scrutiny. I rather suggest that the problem is more wide-ranging than the Minister was telling us in his very careful reply to the amendment.