Members of the public who wish to contact SIS from the UK may do so via PO Box 1300, London SE1 1BD.

If you have information relating to immediate threats to the UK, such as terrorism, please pass this immediately to the Security Service.

If your information relates to an imminent threat to life or property, please contact the police on 999 or the police Anti-Terrorist Hotline on 0800 789 321.

If you are interested in applying for a career in SIS please visit our careers pages