An unarmed Trident missile being fired during a test

This Royal Navy footage shows the successful firing of an unarmed Trident missile from HMS Vigilant during a test.

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PM: North Korea is threat to UK

David Cameron has warned it would be "foolish" to consider abandoning its Trident deterrent because the UK faces an increased threat of a nuclear attack from regimes including North Korea. He claimed rockets from Pyongyang could hit Britain.