Nuclear weapons of the United KingdomThe United Kingdom became the third country (after the United States and the Soviet Union) to develop and, in 1952, test nuclear weapons. The UK is one of nine nuclear-armed states, and one of five recognized by the Treaty on the Non-Proliferation of Nuclear Weapons. As of 2025, the UK possesses a stockpile of approximately 225 warheads, with 120 deployed on its only delivery system, the Trident programme's submarine-launched ballistic missiles.
Vanguard-class submarineThe Vanguard class is a class of nuclear-poweredballistic missile submarines (SSBNs) in service with the Royal Navy. The class was introduced in 1994 as part of the Trident nuclear programme, and comprises four vessels: Vanguard, Victorious, Vigilant and Vengeance, built between 1986 and 1999 at Barrow-in-Furness by Vickers Shipbuilding and Engineering, now owned by BAE Systems.
UGM-133 Trident IIThe UGM-133A Trident II, or Trident D5 is a submarine-launched ballistic missile (SLBM), built by Lockheed Martin Space in Sunnyvale, California, and deployed with the United States Navy and Royal Navy. It was first deployed in March 1990, and remains in service.
Submarine-launched ballistic missileA submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from submarines. SLBMs almost exclusively carry one or multiplenuclearwarheads, and play an important role in nuclear strategy as a highly reliable and non-vulnerable second strike option. Nuclear-armed SLBMs are operated by China (JL-3), France (M51), India (Sagarika), Russia (Sineva, Lajner, and Bulava), the United Kingdom and the United States (both Trident II).
Ministry of Defence (United Kingdom)The Ministry of Defence (MOD or MoD) is a ministerial department of the Government of the United Kingdom. It is responsible for implementing the defence policy set by the government and serves as the headquarters of the British Armed Forces. Its principal objectives are to defend the United Kingdom of Great Britain and Northern Ireland and its interests, promote national interests globally and to strengthen international peace and stability.
Royal NavyThe Royal Navy (RN) is the naval warfare force of the United Kingdom, responsible for defending the country, the Crown Dependencies, and the Overseas Territories from naval attack or invasion. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against France.
Multiple independently targetable reentry vehicleA multiple independently targetable reentry vehicle (MIRV) is an exoatmospheric ballistic missile payload containing several warheads, each capable of being aimed to hit a different target. The concept is almost invariably associated with intercontinental ballistic missiles carrying thermonuclear warheads, even if not strictly being limited to them.
Thermonuclear weaponMulti-stage fusion-fission nuclear weaponDiagram of the US W88 warhead, a standard thermonuclear design.
SubmarineWatercraft capable of independent underwater operationRussian Akula-class submarine of the Northern Fleet, in 2008World War II fleet submarine (Gato, Balao or Tench class), commissioned 1941–1945The first nuclear-powered submarineUSS Nautilus (SSN-571), commissioned 1954The ballistic missile submarineUSS George Washington (SSBN-598), commissioned 1959A submarine (often shortened to sub) is a watercraft capable of independent operation underwater.
Deterrence theoryDeterrence theory is the scholarship and practice of how threats of using force by one party can convince another party to refrain from initiating some other course of action. The central problem of deterrence revolves around how to credibly threaten military action or nuclear punishment on the adversary despite its costs to the deterrer. Deterrence in an international relations context is the application of deterrence theory to avoid conflict.
AWE Nuclear Security TechnologiesAWE Nuclear Security Technologies, formerly known as the Atomic Weapons Establishment (AWE), is a United Kingdom Ministry of Defence research facility responsible for the design, manufacture and support of warheads for the UK's nuclear weapons. It is the successor to the Atomic Weapons Research Establishment (AWRE) with its main site on the former RAF Aldermaston and has major facilities at Burghfield, Blacknest and RNAD Coulport.
HMNB ClydeHis Majesty's Naval Base Clyde (HMNB Clyde) is the Royal Navy's main shore establishment in Scotland. It is home to the United Kingdom's fleet of nuclear submarines, including attack submarines and ballistic missile submarines. The main part of the base, officially named HMS Neptune and commonly known as Faslane, lies on Faslane Bay in Gare Loch, an inlet of the Firth of Clyde.*As an Amazon Associate I earn from qualifying purchases.