INTELLIGENCE SERVICES COMMISSIONER
The Rt. Hon. Sir Peter Gibson is the current Intelligence Services Commissioner.
The Commissioner's role is defined by statute under the Regulation of Investigatory Powers Act 2000 (RIPA). Section 59 of the Act provides for the Prime Minister to appoint the Commissioner, who must hold or have held high judicial office within the meaning of the Appellate Jurisdiction Act 1876. He or she is appointed for a period of three years with the possibility of re-appointment.
His job is to keep under review the issue of warrants by the Secretary of State authorising intrusive surveillance (e.g. eavesdropping) and interference with property in order to make sure that the Secretary of State was right to issue them.
Like the Interception of Communications Commissioner, the Intelligence Services Commissioner reviews warrant applications and visits the Security Service and other agencies to discuss any case he wishes to examine in more detail. He must, by law, be given access to whatever documents and information he needs and at the end of each reporting year he submits a report to the Prime Minister which is subsequently laid before Parliament and published.
The Intelligence Services Commissioner is also responsible for reviewing our internally authorised use of directed surveillance (the covert monitoring of targets' movements, conversations and other activities) and of covert human intelligence sources (i.e. agents) to check that we are acting in accordance with the requirements of the law.
Reports of the Intelligence Services Commissioner
Thames House, headquarters of MI5.
The United Kingdom's  (JTAC), a division of the security agency MI5, has now reduced the United Kingdom threat level from 'critical' to 'severe'.

Since the terrorist attacks in London and Glasgow the threat level in the United Kingdom was at 'critical' meaning an "attack was imminent", however the , , today announced the level was to be reduced.

She said, "There is no intelligence to suggest that an attack is expected imminently. However, the reduction of the threat level to severe does not mean the overall threat has gone away."

The MI5 website stated, "This means that future terrorist attacks are still highly likely, but no longer thought to be imminent. The decision has been made by JTAC based on a review of the latest intelligence."

This reduction comes after eight arrests were made in connection to the terror attacks.