Fuses the international vanguard technology, the making world first-class product.

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Mr Cameron visited HMS Victorious, one of the Royal Navy's Vanguard-class submarines, which is returning from its 100th patrol.

BBC: David Cameron praises Scottish defence industry

Mr Cameron had earlier visited HMS Victorious, one of the Royal Navy's four Vanguard-class submarines which keep Trident nuclear missiles continuously at sea, which is returning from its 100th patrol.

BBC: UK must keep Trident nuclear deterrent - David Cameron

It argues that the life of Vanguard-class boats can be stretched at most to 30 years, not to 44 years as the service of America's equivalent Ohio-class boats can be.

ECONOMIST: The decision to renew Trident was a foregone conclusion