As with much of what goes on in 'international politics' the ownership of nuclear weapons by the UK has much more to do with the UK trying to cling on by its fingertips to a role and influence at the top level of various world bodies than any kind of potential real use (or deterrent) as a weapon. It could almost be seen as a form of 'luxury good' for part of the 'establishment' in that, while keeping some sectors of industry going, it does nothing in the productive sense (and probably little in spin-offs) and merely proves that much of the UK is still living as if it were in the 1950s.
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