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Contacts and Complaints - Security Service MI5

The MI5 Phoneline
for providing information to the Service

Since March 1998, a public telephone number - the MI5 Phoneline: 0171 930 9000 - has been available for those wishing to provide information to the Service to assist it in its work. Members of the public may for instance become aware of activities which they think may be relevant to the Service's functions: others may be personally involved with groups investigated by the Service, or closely associated with them, and may have information to offer via the Phoneline. As an alternative to the Phoneline, information may be sent in writing to the Service's Enquiries Desk (details below). Any information provided, and the identities of callers, will be treated with the greatest care.

The MI5 Phoneline should not be used for enquiries about the Service, including employment opportunities, which should be sent instead to the Enquiries Desk. In addition, it should not be used for reporting information about imminent threats to life or property, which should be passed to the police using the 999 system, or via the Anti-Terrorist Hotline - 0800 789321 - which is for giving the police information about a terrorist incident which has happened or is about to occur.

Enquiries about the Service

Members of the public who wish to write to the Security Service, including those with enquiries about joining the Service, should contact:

The Enquiries Desk
PO Box 3255
London SW1P 1AE

All correspondence will be treated in the strictest confidence.

How to Complain

Members of the public who believe that the Security Service has acted improperly in relation to them or to their property and who wish to complain should write to:

The Security Service Tribunal
PO Box 18,
London SE1 0TZ

Members of the public who believe that their post or telephone calls have been intercepted in breach of the Act and who wish to complain should write to:

The Interception of Communications
Act Tribunal
PO Box 12376,
London SW1P 1XU