Hi Tom - just for interest, this is on the Facebook page today for HM Naval Base PortsmouthPlease note there will be a full test of the Naval Base’s nuclear emergency alerting siren at 0930 today which may be able to be heard outside of the base.It is a statutory requirement to test the alarm three times a year and this test is being conducted in agreement with Portsmouth and Gosport local authorities.The two-tone siren will be sounded for one minute for the test.
