I thank the noble Lord, Lord Carlile, and I think that is right. If this debate has done nothing else, it has probably given the impetus to ensure the oversight board meets more regularly, and I shall take that back.
There needs to be evidence of systemic failures to justify a review. I will take back the point about the oversight board meeting more often. Prevent should be subject to proper scrutiny, but I hope I have already outlined a number of mechanisms for this. It is also open to the Home Affairs Select Committee to conduct an inquiry into Prevent, should it wish to do so. Furthermore, the fifth anniversary of the passage of the Counter-Terrorism and Security Act 2015 does offer the opportunity to undertake the normal pre-legislative review of the provisions in Part 5 of that Act, providing the legislative framework for Prevent.
I hope my explanation has provided some comfort to noble Lords. I suspect by the gathering crowds it has not.