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The precise number is classified, & not publicly available...

Probably there are 150-200 British built nuclear warheads for the American supplied Trident SLB Missile system. It's also possible that some smaller nuclear warheads have been developed for the Tomahawk cruise missiles also carried by Royal Navy nuclear submarines, but this is speculative!

Officially, all the "free-fall" nuclear bombs once carried by the RAF's "Strike Command"/ "V Force" aircraft have been decommissioned, but many suspect that some (maybe a hundred or so) have been upgraded & retained for "contingencies".

There are no longer any US controlled nuclear warheads based permanently in Britain, although nuclear armed American submarines operate routinely from UK naval bases under joint facility agreements between UK & US Governments.

The British Army (as per current NATO doctrine/ international arms control agreements/ treaties) no longer maintains/ controls any tactical nuclear weapons systems.

Bottom line, however, is that no-one apart from the Prime Minister, Intelligence & Defence Chiefs, & probably some very senior Civil Servants, knows the exact number of nuclear weapons currently retained by the UK: in order effectively to deter, it's best to keep potential enemies guessing...

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