I am grateful to the right hon. Gentleman for his welcome for the principles. The memorandum of understanding between the Government and the ISC does make it clear that the ISC is entitled to take evidence from Ministers, senior officials and agency chiefs. That is in line with the relationship between the Government and every departmental Select Committee, and I am not persuaded that there is a need to change that.
I understand the argument that my right hon. Friend is making, but I repeat the point that it is a long-established principle, reflected in the memorandum of understanding with the ISC, that it is senior officials, agency chiefs and Ministers who are accountable to the Committee, rather than junior officials.