Is the United Kingdom a Genuine Nuclear Power? A Look at the British Nuclear Forces' Unique Lack of Independence

Following its first successful nuclear weapons test on October 3, 1952, the United Kingdom became the third country after the United States and Soviet Union to field an independently developed nuclear deterrent - achieving this seven years after then U.S. and three years after the USSR. 

London sought to turn the tide in the post-Second World World War world against its decline as a great power, which was well underway by the early 1950s with the vast majority of the British Empire having gained or being well on its way towards gaining independence after centuries of imperial rule. 

With a successful independent nuclear program which only the world's two superpowers otherwise had, Britain's claim that it was still a leading world power, despite its failing and highly indebted economy and its declining conventional military capabilities, could be substantiated to some degree. 

In the wake of Britain's first nuclear test, the United States and the USSR both proceeded to test thermonuclear weapons with destructive capabilities orders of magnitude greater than the atomic bombs previously used. The first U.S. test of such a weapon came exactly four weeks after Britain's first nuclear test, on November 1 1952, with the first Soviet test following on November 22, 1955. 

The emergence of thermonuclear arsenals led to significant debate among Britain's military and civilian leadership regarding their country's place in a world dominated by two military superpowers, and whether it was worthwhile for a relatively small state with no immediate threat to its own security, which was in any case covered by the American nuclear umbrella, to attempt to qualitatively match the nuclear capabilities of the superpowers and develop its own thermonuclear warheads. 

Many in Britain's military leadership felt that the country's position would be best served by allocating funds to support declining conventional capabilities rather than spending on costly nuclear weapons, on the basis that conventional war was a far more likely prospect than nuclear war as both the U.S. and USSR would be deterred from using nuclear weapons by the power of one another's arsenals. Despite this, in a decision thought to have been influenced by pride and prestige, Britain invested heavily in developing a hydrogen bomb which it proceeded to test in 1958. 

The reasons for this were outlined by the Chiefs of Staff Committee which stated: "If we did not develop megaton weapons (thermonuclear bombs) we would sacrifice immediately and in perpetuity our position as a first-class power." Nuclear weapons programs thus appeared to be Britain's means of resisting the post-1945 world order and clinging to what it perceived to be its rightful place as a world-leading power.

Britain's reasons for developing and maintaining nuclear weapons and their strategic implications remain unique today among the world's nine nuclear weapons states. The United States had invested in a nuclear weapons program to cement its place as the world's dominant military power and preempt the development of similar weapons by Nazi Germany. 

The USSR, China, India, Pakistan, North Korea, and Israel had all subsequently developed nuclear weapons to counter imminent national security threats on their borders. France meanwhile developed and maintained such weapons to grant it a degree of independence from the United States, which allowed it to withdraw from NATO command while maintaining its nuclear deterrence.

 In Britain's case, however, nuclear weapons development did not bear any similarly direct relationship to a national security threat, something the country has not faced on its borders since its war with Nazi Germany, nor was development used to exercise any degree of independence from the United States or NATO as had been the case with France.

The purpose of Britain's nuclear forces has continued to be questioned to this day, particularly after deep budget cuts under a stringent austerity program affected almost all sectors of government spending in the 2010s and seriously undermined the armed forces' conventional capabilities. According to a report by the British Parliament's Select Committee on Defence in 2006, Britain's nuclear submarines armed with Trident intercontinental-range ballistic missiles, which were the only nuclear force the country deployed, remained wholly dependent on the United States to operate and did not represent any form of independence in political or military decision making. The report stated: 

"The fact that, in theory, the British Prime Minister could give the order to fire Trident missiles without getting prior approval from the White House has allowed the UK to maintain the facade of being a global military power. In practice, though, it is difficult to conceive of any situation in which a Prime Minister would fire Trident without prior U.S. approval. The USA would see such an act as cutting across its self-declared prerogative as the world's policeman, and would almost certainly make the UK pay a high price for its presumption. The fact that the UK is completely technically dependent on the USA for the maintenance of the Trident system means that one way the USA could show its displeasure would be to cut off the technical support needed for the UK to continue to send Trident to sea."

The report further noted regarding the lack of independence of Britain's nuclear forces - serving as an effective appendage of American nuclear forces: 

"In a crisis, the very existence of the UK Trident system might make it difficult for a UK prime minister to refuse a request by the US president to participate in an attack. The UK Trident system is highly dependent, and for some purposes completely dependent, on the larger US system... The UK's dependency on the USA has operational significance. For example, the UK's reliance on U.S. weather data and on navigational data provided by the U.S. Global Positioning System (GPS) means that, should the USA decide not to supply this data, the capacity of the UK's Trident missiles to hit targets would be degraded."

Ultimately Britain's nuclear arsenal remains the only one in the world which is unable to be utilized independently without permission from a foreign power. This is largely a result of the country's original purpose for acquiring nuclear weapons - namely that because their development was not a response to a critical national security threat or a tool to assert independence within the Western Bloc they could be made very dependant on the United States. 

Britain today maintains a sizeable nuclear arsenal, which as of 2021 stands at 120 operationally available warheads and a further 95 in reserve - with plans to increase the number operational. Of the available warheads, only 40 are deployed at a time, all from nuclear-powered ballistic missile submarines equipped with intercontinental-range ballistic missiles. While no other state, be it Israel, Pakistan, France, or North Korea, has ceded its ability to operate its nuclear arsenal to another country, this is exactly what Britain has done which represents a decision entirely unique among the world's nuclear powers.

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