British and American Trident missiles are described as coming from the same stockpile, with each country owning an allotted number. Missile ownership and national warhead development are separate parts of the arrangement. A British replacement for the Holbrook warhead is expected in the 2030s.
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Shared Trident missiles and British warhead development
Britain and the United States draw Trident missiles from a shared stockpile while Britain develops a replacement warhead.