The consequences might be extremely serious, though. Bombs on US, Europe and the USSR would wipe out most of the biggest global food exporters at the time, with particular effects for foodstuffs like grain, and would also destroy their huge stores. Production and distribution of vital agricultural products like fertiliser would be severely disrupted, to say the least. That, on its own, would lead to severe rationing and serious shortages in well-ordered Southern nations, and severe famine in other parts. And ozone depletion in the southern hemisphere would also have a big negative impact on agriculture, even without a nuclear winter.
There would also be a serious danger of major political conflict. Several nations which were restrained by the superpowers and their major allies would now be free to attack other nations conventionally, and they would have big incentives to do so where oil, untainted agricultural land and other vital resources are at stake. Coups, inter-state or Middle Eastern conflict, ethnic or religious wars - if these events took place, they would be much more difficult to stop.
It's probable that none of these conflicts would have led to nuclear war, and that, after a couple of decades, some sort of stability would have emerged. But life could still be pretty unpleasant for many, or even most, in the southern hemisphere, on a par with life in the worst of the twentieth century conflicts. But even that would probably look like paradise to those left in the UK....
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