An Act to make provision about the Secret Intelligence Service and the Government Communications Headquarters, including provision for the issue of warrants and authorisations enabling certain actions to be taken and for the issue of such warrants and authorisations to be kept under review; to make further provision about warrants issued on applications by the Security Service; to establish a procedure for the investigation of complaints about the Secret Intelligence Service and the Government Communications Headquarters; to make provision for the establishment of an Intelligence and Security Committee to scrutinise all three of those bodies; and for connected purposes.