My Lords, I agree that we should not give away our freedoms in response to terrorism. However, I am satisfied that, properly crafted, this legislation need not do so. It would be a good idea if part of that crafting were to include a sunset clause, primarily for the reasons set out by the noble Lord, Lord Pannick. It is the practicalities of this measure—how it will work in practice—that are most in doubt. Those practicalities will significantly impact on the rights of people on whom the orders are imposed. So a sunset clause is a good idea. It is also a good idea for the reason set out by my noble friend a moment ago.
Two years is too short. The threat will be with us for much longer than two years, so that will be too short a time to assess the workings of this legislation. However, I support the idea of a sunset clause so that the House can thoroughly review how the legislation is working in practice.