My Lords, before my noble friend responds, which I think he is about to do, I will take the opportunity to say that the motivation behind my noble friend’s amendment is a very sound one. The fact that you do not know whether you are being wrongly investigated is contributing to a sense of unease about the intelligence provisions and this legislation. This is a problem we have to try to address.
The Minister has put forward some genuine, practical considerations which would make it difficult to implement a clause such as my noble friend’s. This is not a new problem: throughout the history of the Investigatory Powers Tribunal, we have had the problem that the only answer that could be given is that no unlawful activity has been carried out, which does not tell you whether any activity has been carried out. If it was carried out, it was lawful, but maybe it was not carried out at all. It was an infuriating answer for people who suspected that they might have been subject to investigatory powers but had no way of knowing or being certain.
It is a problem which even existing procedures sidestep. The Minister referred to ways in which notification may take place in cases where a mistake has been made. Included in the category of people to whom that might apply would be the very people he said he did not want to assist by bringing to their attention that on this occasion, they had been unsuccessfully investigated but there might well be reason to investigate them in the future. The Minister was wrong to say that the people to whom we would be imparting this information were criminals or people threatening the security of the state. If an investigation has not been successful in identifying who is involved in a radicalisation ring or in planning a kidnapping, that may well be because some of those people genuinely were not involved in any way, and some other factor—a mistaken number, for example—had drawn them into the net of the inquiry. Maybe they were known to others involved but genuinely played no part in it, and that emerges from the intelligence.
We should recognise, in considering this suggestion, that strong fears arise from uncertainty and from an inability to establish whether you have been the subject of investigation or not, when there is no reason for you to have been so subject. That of course places a very heavy burden on the commissioners, because rather like special advocates, they have to represent the concerns of people with whom they cannot check—they cannot ask, “How do you feel about this?”. At the very least, it is a salutary reminder of the importance of the processes which this Bill will introduce and of the involvement of judicial commissioners, and we may need to revisit this issue in the future.