![At least one of Britain's Trident nuclear-armed submarines is on patrol at all times. PA](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/VGRM7XCSFUFLKXB635U6VKHPSU.jpg?smart=true&auth=00def74639a6347ff91ee2540446f6b0c0b22232e3a8bfaa128f4d6fe67a16ec&width=400&height=225)
At least one of Britain's Trident nuclear-armed submarines is on patrol at all times. PA
At least one of Britain's Trident nuclear-armed submarines is on patrol at all times. PA
UK Trident nuclear missile misfires during test launch
Concern for Britain's nuclear deterrent after mishap on HMS Vanguard