Counter-Terrorism and Security Bill

My Lords, I strongly support the inclusion of a sunset clause, for the very good reasons that have been given. The only debate is, really, how long. Two years is possibly too short. We need to think about how quickly we will be able to gain information about how it is working, what the full implications are and so on. Equally, however, we do not want it to be too long. So how long is a piece of string? I would think perhaps three or four years. However, I believe absolutely that we should have a sunset clause.