HMS Vigilant is a Vanguard class submarine based at HMNB Clyde at Faslane in Argyll and Bute. It is one of four British submarines armed with the Trident ballistic missile system. The Royal Navy ...

HMS Vigilant - one of Britain's four Vanguard-class submarines which carry up to eight Trident missiles armed with nuclear warheads - was docked at a US naval base at the time. The BBC understands ...