PTN

Public Telephone Number. The Security Service public telephone number (020 7930 9000) is available for anyone wishing to help the Service by providing information relevant to our work. (Information about imminent threats to life or property should be reported to the Police on 999 or via the Anti-Terrorist Hotline (0800 789 321)).
Found on http://www.encyclo.co.uk/local/20790
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