My Lords, I do not have much to add to the debate. From these Benches, we fully support the amendments proposed by the noble Lord, Lord West, and the excellent way in which he presented them. They have the support of the whole ISC, which in this respect has done a great service to us all in taking forward the discussion. These amendments certainly improve the Bill.
The point that the noble Lord, Lord West, made is exceptionally important—the fact that this has to be in the Bill, and that we need it to guide us in how we take this forward. For those who read our proceedings, it is important to repeat that what we are discussing here is the interception of communications of parliamentarians, and the fact that the triple lock was introduced to give additional protection to that. The role of the Prime Minister becomes crucial in that, for obvious reasons.
I join others in thanking the noble Lord, Lord Anderson, for the way in which he has presented his arguments, and the discussions and debates that have gone on in this Chamber and outside it. He has done a great service to all of us by tabling what seems on the face of it a simple amendment—simply changing one word, from “unavailable” to “unable”—but is actually of huge significance. We have concerns about it, which we have expressed in this Chamber and elsewhere— indeed, the noble Lord, Lord West, explained them. Notwithstanding the remarks of the noble Lord, Lord Carlile, and others, we are worried about where it takes us with respect to conflicts of interest, and who decides that there is a conflict of interest for the Prime Minister in circumstances in which the Prime Minister themself does not recognise that there is a conflict of interest. I agree with the noble Lord, Lord Anderson, and others, that there may be a need for this discussion to continue—but who decides whether
the Prime Minister has a conflict of interest, if the Prime Minister themself does not recognise that, is an important discussion to have. In the end, the system rests on the integrity of the Prime Minister.
The way in which the ISC has tried to bring forward some conditions to what “unavailable” means is extremely important, and we support that, as indeed we support the amendments that try to ensure that those who take decisions are those various Secretaries of State who may be designated under the Bill to take decisions, should the Prime Minister be unavailable. It is extremely important for those Secretaries of State to have experience of the use of those warrants. Again, the amendments proposed by the noble Lord, Lord West, deal with that, and we are very happy to support them.