RIPA 2000 also established the Investigatory Powers
Tribunal (IPT). This investigates complaints by the
public against the agencies. Members of the IPT are drawn from the
judiciary and senior members of the legal profession. They can ask
the Intelligence Services Commissioner to assist in providing
information from SIS which they need to see. They visit SIS
headquarters to investigate complaints. The current President of
the IPT is Lord Justice John Mummery.