Because, as I have already said and as the hon. Gentleman acknowledges, the ISC is a different kind of Committee. The people concerned are handling different information—information that they cannot share—and there are occasions when there is an ongoing operation, things are moving at a fast pace, it is impossible to convene a meeting of the full Committee, and the Prime Minister, the heads of agencies and the Foreign Secretary—whoever is relevant—have to be able to talk
to somebody. On some occasions the Chair has been the person they speak with, which is entirely appropriate, but in order for them to be able to do so the Chair must have the confidence of senior Ministers and the heads of the agencies. I think that is an important principle. Otherwise, they will feel inhibited about sharing vital information, which often has to be provided at very short notice, with the Chair at least.
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