History
In 1980 the British government announced its intention to replace its independent nuclear deterrent, and formally sought permission to acquire the Trident I C-4 missile then in service with the US Navy.
Trident would replace the Polaris system of four Resolution-class submarines, equipped with the US-built Polaris A3 missile. These missiles were originally armed with triple ET.317 warheads aimed at a single target, later upgraded by the UK Chevaline programme to two hardened warheads accompanied with countermeasures.
Following the acceleration of the US Trident II D-5 programme, the existing Polaris Sales Agreement was modified in 1982 to permit the supply of the more advanced missiles. Under the agreement, the UK would lease 65 Trident II D-5 missiles from a larger pool of such weapons based at Naval Submarine Base Kings Bay in the United States. The US would retain responsibility for the maintenance of the missiles, and the UK would manufacture its own warheads and submarines.
The entire project was projected to cost £5 billion, including the four submarines, the missiles, new facilities at Coulport and Faslane and a five per cent contribution to Trident II D-5 research and development. The option for a fifth submarine was discussed at the time but later discounted, and the number of missiles leased was later reduced from 65 to 58.
The UK programme's future was secured the following year when the Conservative government won the general election, defeating the Labour opposition which had pledged to cancel the programme.
The Vanguard-class submarines were built between 1986 and 1998 by Vickers Shipbuilding and Engineering at Barrow-in-Furness, Cumbria. The first British Trident missile was test-fired from HMS Vanguard on 26 May 1994, and Vanguard went on to begin the first Trident patrol in December of that year. According to the Royal Navy, at least one submarine has always been on patrol ever since.
Trident has been the UK's sole nuclear weapons system since the retirement of the WE.177 tactical nuclear weapon following the 1998 Strategic Defence Review.
Read more about this topic: UK Trident Programme
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