It has come to light that MI5 may well be holding files on several members of the House of Lords
I asked the Minister: If the police or security services chose to intercept our communications, would anyone in Parliament have the power to authorise or not authorise that?
Baroness Williams of Trafford replied for HMG: I thank the noble Baroness for giving me notice of the fact that she was going to raise this issue; it is not really part of this Question, but that never stops her. As I said, we do not use intercept warrants as court evidence. In terms of who would authorise what, the Home Office would authorise its various agencies, the Foreign Office its agencies and the Northern Ireland Office its agencies, so it would be for those Secretaries of State to authorise those warrants.
Baroness Jones of Moulsecoomb 