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They consist of four -class ballistic missile submarines (SSBN) that each carry up to 16 Trident II D-5 submarine-launched ballistic missiles (SLBM).Four submarines are believed to be the minimum number required to carry out continuous at-sea deterrence (CASD) while allowing adequate time for the four phases of the continuous patrolling cycle: patrol, reserve, training and repair.  Britain's strategic submarine fleet is based at Her Majesty's Naval Base in Clyde, Scotland, while its operational nuclear warheads are stored at the nearby Coulport ammunition base.NTI Co-Chair Sam Nunn, with former Secretary of Defense and NTI Emeritus Board Member William J. The United Kingdom's involvement in nuclear energy and weapons development dates back to 1940 when two émigré scientists based in England, Otto Frisch and Fritz Peierls, laid the conceptual groundwork for the atomic bomb.Initially conducting its own research, the United Kingdom later sent several scientists to Los Alamos to contribute to the Manhattan Project. We have published a Privacy Notice that explains who we share it with, who the data controllers are and what rights you have.
 Additionally, the Liberal Democrats―the junior partner in the UK's coalition government—have been critical of the decision to replace the current naval deterrent with a "like-for-like" system, and have argued that cheaper alternatives have not received due consideration. Although the United Kingdom has no plans to expand its strategic deterrent, it is planning to replace the existing Trident-carrying nuclear submarines with what it calls a "like-for-like" system (essentially the same delivery platform but in modernized form). The modified submarines will be powered by the PWR3, an updated pressurized water reactor.You can read this privacy notice at https://uk/government/publications/national-security-vetting-privacy-notice.We also recommend that you read the Cabinet Office document HMG Personnel Security Controls, which explains the purpose for which we undertake national security vetting and the checks that are carried out.
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